Strap for Terrasport II Black / Strap

The lug width (also called strap width) of the Terrasport M1-37-44-LB is 20 millimetres. This measurement is the distance between the centres of the lateral case lugs and is essential for purchasing compatible straps. Any aftermarket strap must be precisely 20mm to avoid aesthetic gaps or mechanical stress on the case attachments.

Strap choice for the Terrasport M1-37-44-LB depends on intended use. Black alligator or dark brown calf leather offer formal elegance and effective contrast against the brushed steel case. For sports-oriented wear, a navy or military green NATO maintains practical functionality. Dark grey FKM rubber represents the ideal solution for aquatic environments or demanding conditions. The 20mm width in any material ensures balanced proportions with the 40mm case diameter.

To change the strap on the Terrasport M1-37-44-LB, position the watch on a soft surface and use a spring bar tool (specialised pin removal tool). Insert the tool tip into the small lateral hole of one lug pin, gently compress the internal spring and slide the pin out of the lugs. Repeat for the second pin. Install the new 20mm strap by reversing the procedure, ensuring both pins are fully inserted. Exercise caution to avoid scratching the brushed steel case during the operation.

Yes, any artisanal or industrial strap manufactured for the 20-millimetre lug width is compatible with the Terrasport M1-37-44-LB. Compatibility depends exclusively on correct width measurement: 20mm non-negotiable. Leather straps (alligator, shell cordovan, calf), fabric options (NATO, cordura) and rubber (FKM) are all valid choices, provided they maintain this critical width and feature standard lug pins (1.5–1.6mm diameter).

A leather strap's lifespan depends on construction quality, tanning method and usage patterns. An artisanal calf or alligator strap, vegetable-tanned, typically guarantees 3–5 years of moderate daily wear. Constant exposure to humidity, perspiration and direct sunlight significantly reduces longevity. Shell cordovan, being denser, offers extended lifespan (5–7 years). Regular maintenance—gentle cleaning with a damp cloth and occasional conditioning—substantially extends strap life. For intensive or aquatic use, FKM rubber or NATO fabrics prove far more durable.