Spinnaker Dives Back Into Bikini Bottom With the Fleuss Automatic SpongeBob SquarePants Shell Mates Limited Edition

Spinnaker returns to Bikini Bottom with three character-driven dive watches inspired by Gary, Mr. Krabs and Patrick, combining playful design with a 43 mm automatic dive-watch platform.

Spinnaker Fleuss SpongeBob Shell Mates brings the colourful world of Bikini Bottom to a new trio of automatic dive watches, this time shifting the spotlight from SpongeBob himself to three of the characters who define his world: Gary, Mr. Krabs and Patrick.

Rather than focusing solely on SpongeBob himself, the new collection explores the characters who surround him and help define his world. Each watch takes a different personality from Bikini Bottom and translates it into a colourful interpretation of Spinnaker’s Fleuss Automatic dive-watch platform, creating a collection that combines mechanical watchmaking with the playful storytelling of the series.

There are three individual references in the collection: Gary the Grey, limited to 350 pieces; Krabs Blue, limited to 450 pieces; and Patrick Green, limited to 500 pieces. Each is individually numbered and priced at USD $395.

If you’re considering adding this piece to your collection, purchasing through this Link, helps support WatchOverviews, at no additional cost to you.

A Fleuss Built for Bikini Bottom

At the heart of the collection is Spinnaker’s Fleuss Automatic, a platform designed around the characteristics of a capable everyday dive watch. While the new editions introduce considerably more expressive colours and character-specific details, the underlying construction remains firmly rooted in the world of mechanical diving watches.

Each model features a 43 mm stainless-steel case with a thickness of 13 mm. The relatively substantial dimensions give the Fleuss a strong wrist presence, while the combination of a screw-down crown, unidirectional rotating bezel and 15 ATM water resistance reinforces its functional credentials.

The watches are equipped with a sapphire crystal featuring an anti-reflective coating, providing improved scratch resistance and helping maintain legibility under different lighting conditions. A 22 mm nylon strap completes the design, with the colour of each strap chosen to complement the personality represented by the individual model.

Although the collection is clearly designed to appeal to SpongeBob fans, Spinnaker has ensured that the watches retain the proportions and functionality expected from the Fleuss platform.

Three Characters, Three Personalities

The central idea behind the Shell Mates collection is that each watch should communicate the personality of its respective character without relying solely on obvious imagery.

The first is Gary the Grey, inspired by SpongeBob’s loyal pet. Limited to 350 pieces, this version takes a more understated approach, combining an off-white dial with pink accents. The restrained palette reflects Gary’s distinctive appearance while giving the watch a comparatively subtle presence within the collection.

The second model is Krabs Blue, inspired by SpongeBob’s demanding boss, Mr. Krabs. Limited to 450 pieces, it uses a deep blue dial with contrasting details that give the watch a stronger and more assertive visual identity. The darker colour palette also fits naturally with the underwater theme of the Fleuss.

Completing the trio is Patrick Green, limited to 500 pieces. Inspired by SpongeBob’s best friend, this version adopts vibrant green tones that reflect Patrick’s unconventional and carefree personality. Of the three, it is arguably the most playful interpretation of the collection’s concept.

Together, the three watches form a small cast of characters rather than simply offering three colour variations of the same model.

Character in Every Second

One of the most distinctive details across the collection can be found on the seconds hand.

Spinnaker has created a custom-designed seconds hand for each character, subtly incorporating their identity into the movement of the watch. Instead of restricting the collaboration to the dial or case, the characters effectively become part of the passage of time itself.

It is a small detail, but one that gives the collection a more thoughtful connection to its source material. Every movement of the seconds hand becomes another reminder of the character represented by the watch.

This approach also prevents the collaboration from feeling like a simple graphic treatment applied to an existing watch. The character-specific elements are integrated into the physical design of the timepiece.

Super-LumiNova® Brings the Characters to Life

The playful character of the collection becomes even more apparent in low-light conditions.

Spinnaker has applied Swiss Super-LumiNova® to the dials, hands and bezels, providing the necessary legibility for a dive watch while introducing another visual dimension to the collaboration.

During the day, the watches rely on their distinctive colours and character-inspired details to create their personalities. Once the lights go down, however, the luminous elements become more prominent, giving each model an unexpected and playful appearance.

This combination of practical lume and character-driven design is particularly appropriate for the Fleuss, allowing the collection to retain an authentic connection to dive-watch functionality while still embracing the visual language of SpongeBob SquarePants.

Mechanical Heart: The M-MIY-8245

Behind the character-driven exterior, the watches are powered by a Japanese automatic movement, the M-MIY-8245.

The movement features a two-hand and small-seconds configuration and provides the mechanical foundation for the Fleuss Automatic platform.

Spinnaker has also fitted each watch with an exhibition caseback, allowing the wearer to see the mechanical movement through the rear of the case. This adds an element of transparency to a collection that otherwise focuses heavily on visual storytelling.

The exhibition caseback also reinforces the fact that, despite their animated inspiration, these are mechanical watches designed to be appreciated as timepieces in their own right.

A Dive Watch at Heart

The Shell Mates collection may be colourful and playful, but Spinnaker has not abandoned the functional characteristics of the Fleuss.

With 15 ATM water resistance, the watches are rated to approximately 150 metres. The screw-down crown helps reinforce the water-resistant construction, while the unidirectional rotating bezel provides the functionality traditionally associated with dive watches.

The sapphire crystal adds another practical advantage, offering greater resistance to scratches than mineral crystal, while the anti-reflective treatment helps improve visibility of the dial.

The combination of these features means that the watches remain rooted in the world of diving even though their visual identity is very different from a conventional tool watch.

Matching Nylon Straps

Each model is paired with a 22 mm nylon strap in a colour selected to complement its respective character.

The choice of nylon is consistent with the more casual and versatile nature of the collection. It also works particularly well with the colourful dials, keeping the watches from becoming overly formal despite their mechanical construction.

The result is a collection designed to transition between different environments, whether worn near the water or as an everyday watch on land.

Limited Editions for SpongeBob Fans and Collectors

The production numbers further distinguish the three models.

Gary the Grey is limited to 350 pieces, making it the rarest of the three. Krabs Blue follows with 450 pieces, while Patrick Green is limited to 500 examples.

Every watch is individually numbered, giving each piece a specific place within its respective limited edition.

With an RRP of USD $395, the collection occupies a relatively accessible position within the world of automatic mechanical watches, while the limited production and licensed character designs give it additional appeal for collectors of both watches and SpongeBob SquarePants memorabilia.

Availability

The Spinnaker Fleuss Automatic SpongeBob SquarePants Shell Mates Limited Edition will be available to order from 28 August to 6 September 2026.

The collection brings together two very different worlds: the technical language of a mechanical dive watch and the colourful storytelling of one of the most recognisable animated series of the past decades.

Rather than simply placing SpongeBob imagery onto an existing model, Spinnaker has used three supporting characters to create distinct personalities across the collection. Gary, Mr. Krabs and Patrick each receive their own colour palette and details, while the Fleuss platform provides a common mechanical foundation.

Technical Specifications

Final Thoughts

The Spinnaker Fleuss Automatic SpongeBob SquarePants Shell Mates Limited Edition is an interesting continuation of Spinnaker’s collaboration with one of the most recognisable fictional worlds beneath the surface.

What makes this release particularly appealing is the decision to move away from SpongeBob himself and instead focus on the characters who help make Bikini Bottom what it is. Gary, Mr. Krabs and Patrick each bring a different personality to the Fleuss, resulting in three watches that feel connected without simply being different colourways.

At the same time, the collection retains the essential characteristics of the Fleuss Automatic: a 43 mm stainless-steel case, sapphire crystal, automatic movement, screw-down crown, unidirectional bezel and 15 ATM water resistance. The character-specific seconds hands, Super-LumiNova® details and matching nylon straps then add the playful layer that makes these watches unmistakably part of the SpongeBob universe.

For fans of the series, the limited production numbers and individual numbering add a clear collectible dimension. For watch enthusiasts, the appeal lies in the fact that the collaboration is built around a genuine automatic dive-watch platform rather than a purely decorative novelty.

The result is a collection that manages to combine mechanical watchmaking, dive-watch functionality and cultural storytelling without losing the playful spirit that made SpongeBob SquarePants such an enduring part of popular culture.

If you’re considering adding this piece to your collection, purchasing through this Link, helps support WatchOverviews, at no additional cost to you.

For more information, please visit the official Spinnaker website.
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