Strap for Seamaster Aqua Terra 150m Master Co-Axial 38.5 Red Gold / Grey / Bracelet

The lug width of the Omega Aqua Terra 231.53.39.21.06.003 is 20 millimetres. This measurement, calculated between the inner edges of the two lugs, is constant on new specimens; however, on vintage watches a direct measurement with a digital calliper is advisable before ordering an aftermarket strap.

Dark brown alligator remains the most coherent choice, enhancing the warm charge of the gold and creating synergy with the teak dial. Alternatively, light brown calf amplifies brilliance, while charcoal grey alligator adds sophistication if the dial is sideral silver.

The strap is removed using a spring bar tool: insert the tip into the lateral slots of the lug, compressing the internal spring until it releases. Extract the attachment and repeat from the other side. Installing the new strap is the reverse process. We recommend gentle, even pressure to avoid micro-scratches on the Red Gold case.

Yes, any strap with a 20mm lug width is compatible. Milano Straps offers straps in alligator, calf, vegetable tanned leather, NATO and rubber, customisable with initials, bespoke length and choice of stitching thread, guaranteed for 18 months.

Durability varies by material: premium quality alligator and calf last 3–5 years with proper maintenance (periodic cleaning, protection from water and direct sunlight). Shell cordovan, thanks to its single-layer fibre, reaches 5–7 years. Vegetable tanned leather tends to age visibly after 2–3 years, acquiring a unique patina. A metal deployant does not mark the fibres and extends the strap's lifespan.