Sinn
Diving Watches 1011.020— lug 22mm

The Sinn 1011.020 is fitted with 22mm lugs. This measurement is standard for professional diving watches with a 44mm case: it allows robust strap materials (NATO, rubber, thick leather) to be accommodated whilst maintaining correct visual proportions. To verify compatibility, measure the internal distance between the two lugs with a calliper: it must be exactly 22mm with no tolerance.

There is no absolute "best," but rather functional choices. For professional diving and marine environments: vulcanised rubber (resistant to salt water, instant drying). For combined daily/diving use: NATO in high-density recycled material, versatile and easy to swap. For a desk-bound professional watch: alligator with vegetable tanning or grain leather, which develop patina over time. The 1011.020's 316L steel case harmonises with all these materials without aesthetic or functional conflict.

The 1011.020 uses the classic tubular lug system. For replacement: 1) Obtain a spring bar removal tool (forked end). 2) Place the watch on a soft surface. 3) Insert the tool tip under the spring bar from one side, applying gentle inward pressure toward the case centre to release the spring. 4) Fully remove the old strap. 5) Insert the new strap, ensuring the spring bar is seated symmetrically in both lugs. 6) Verify the strap is secure and does not tilt. A delicate operation: if in doubt, visit a certified watchmaker.

Yes, the 1011.020 accepts any aftermarket strap with 22mm lug width, provided the spring bar is the correct length (typically 20–21mm overall length for this standard). Verify that material thickness does not exceed 4–5mm: oversized straps may not fit cleanly into the lugs. Choose specialist suppliers who certify compatibility with 44mm diving watches: the strap must be robust enough to withstand the case weight under water pressure.

Durability depends on material and use. An alligator strap with vegetable tanning lasts 3–5 years of daily wear before reconditioning (deep clean, oiling) and may last 7–10 years if properly maintained. Grain leather lasts 2–4 years under normal conditions. A NATO strap in recycled material resists 4–6 years, especially if rotated with other straps. A vulcanised rubber strap has longer life (8–10 years) if not exposed to prolonged UV. The true variable is environment: exposure to pool chlorine, salt water and UV drastically reduces any leather's lifespan; rubber resists better in these contexts.