Swatch · Scuba Fifty Fathoms

Strap for Scuba Fifty Fathoms Pacific Ocean

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width22 mm
Case diameter42 mm
ReferenceSO35P100
FamilyScuba Fifty Fathoms
MovementSwatch caliber Sistem51 Date
CaseBioceramic

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Scuba Fifty Fathoms SO35P100

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Scuba Fifty Fathoms SO35P100, seen from the bench

The Swatch Scuba Fifty Fathoms SO35P100 is a contemporary reinterpretation of Blancpain's 1953 Fifty Fathoms, recognized as the first modern diving watch. It features a 42.30 mm bioceramic case with a deep black dial and luminescent indices. The watch is powered by the Swatch Sistem51 calibre with 51 components, manual winding, and 40-hour power reserve. Water resistance is rated to 300 metres. The 22 mm lug width is a professional standard for aftermarket and artisanal straps.

Frequently asked questions

What is the lug width of the Swatch Scuba Fifty Fathoms SO35P100?

The lug width of the SO35P100 is 22 mm, the professional standard for diving watches, ensuring compatibility with high-quality aftermarket straps. Measurement is straightforward: using callippers positioned between the two lugs, the internal distance must be exactly 22 mm.

Which strap is most suitable for the Swatch Scuba Fifty Fathoms SO35P100?

It depends on usage. For dry, daily wear, vegetable-tanned leather develops a compelling patina that contrasts elegantly with the black dial. For saltwater and chlorinated pools, thick rubber is unbeatable: it maintains grip when wet and resists corrosion. An alligator in dark brown conveys understated theatricality. NATO offers minimal-aesthetic versatility rooted in British military tradition.

How do I change the strap on the Swatch Scuba Fifty Fathoms SO35P100?

Insert the spring bar (the elastic rod housed within the lugs) into the designated seat of a strap change tool, or use specialist watchmaker equipment. Press downward: the pin retracts, freeing one end. Repeat on the opposite side. Remove the old strap. Position the new one by aligning the pins with the lugs, then allow the spring bar to snap into place. Verify the strap is secured firmly on both sides.

Can I fit a third-party aftermarket strap to the SO35P100?

Yes, absolutely. Any strap with a 22 mm lug width is compatible. Artisanal straps from milanostraps.it are specifically crafted for this measurement and guarantee millimetre-precision tolerances. Ensure the pins and spring bars are in good condition; if not, replacement by a professional watchmaker costs mere euros and significantly extends the lifespan of the strap.

How long does a leather strap last on the Swatch Scuba Fifty Fathoms SO35P100?

A quality vegetable-tanned leather strap, properly maintained, lasts 3–5 years with moderate daily wear. Regular saltwater exposure shortens lifespan because salt crystallizes the fibres; applying mink oil monthly would extend longevity. Rubber is virtually indestructible (5–7 years) but may lose elasticity over time. Investing in multiple straps allows rotation and distributes wear across individual pieces.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only