Strap for Promaster 1000M Professional Diver

The lug width of the Citizen ProMaster BN7020-17E is 28 millimetres. This measurement indicates the distance between the attachment pins that connect the strap to the watch case. It is essential to verify this specification before purchasing an aftermarket strap, as an incorrect width will not fit the timepiece properly.

For the BN7020-17E, a vegetable-tanned leather strap represents the most aesthetically coherent choice aligned with the ProMaster's instrumental philosophy. However, if usage is intensively sporty, a NATO strap in cordura fabric or high-resistance synthetic rubber ensures better versatility. The selection depends on balancing desired aesthetics with intended use context.

The BN7020-17E strap is secured via removable pins. Obtain a dedicated spring bar tool and position the watch on a stable surface. Apply gentle pressure with the tool to release the pin, then extract it. Position the new strap by aligning the holes with the case lugs, insert the pin and verify it clicks securely. This process requires approximately 5-10 minutes and does not necessitate professional expertise.

All straps with a 28mm lug width are compatible with the BN7020-17E. This includes quality full-grain leather, NATO straps, synthetic rubbers, alligator and shell cordovan. Always verify the manufacturer's specification: 28mm is the standard for this model. Be careful not to confuse lug width with maximum strap width at the passant, which may vary.

A quality leather strap, subjected to moderate-to-intensive use, has an average lifespan of 3-5 years. Straps in full-grain leather with vegetable tanning tend to last longer than chemically dyed leathers, owing to greater structural density. Lifespan extends significantly if the strap is protected from prolonged water exposure and maintained periodically with specific conditioners. The patina that develops over time does not represent deterioration, but natural aesthetic evolution.