Strap for Seamaster Bullhead Co-Axial Chronograph Black

The lug width of the Seamaster Bullhead 225.12.43.50.01.001 is precisely 22mm. This dimension is specific to this model and is measured with a digital calliper positioned between the metal pins of the two lugs on the case. It is essential to verify this measurement before purchasing an aftermarket strap, as 20mm or 24mm lugs will not fit correctly.

The best strap for the Bullhead is an alligator in vegetable tanning with dark brown tones or a calf in vegetable tanning in black. These materials respect the technical-sport character of the chronograph and age by developing natural patina and character. For more tactical applications, a NATO strap in cotton/nylon satin or FKM rubber offer certified durability and water resistance.

The strap is changed by extracting the spring bars that connect the case lugs to the strap. Use a dedicated removal tool to press inward and extract the pins, then slide the old strap outward. The new strap is inserted by keeping the pins aligned with the lugs, then gently pushed until it locks into place. We recommend having this operation performed by a professional to avoid case damage.

Any strap with a 22mm lug width is compatible with the Seamaster Bullhead 225.12.43.50.01.001. On milanostraps.it you will find a complete selection of artisanal 22mm straps in alligator, calf, shell cordovan, NATO and rubber, all customisable in sizes, colours, initials and stitching thread choice.

A quality leather strap (alligator or calf in vegetable tanning) typically lasts 3-5 years with regular use, depending on humidity exposure and maintenance level. Vegetable tanning ages naturally, developing patina without structural degradation. The artisanal straps from Casati Milano include an 18-month guarantee and can be renewed to extend the useful life of your watch.