Strap for Seamaster Aqua Terra 150M Co-Axial 30 Yellow Gold / Grey / Bracelet

The Omega Aqua Terra 231.50.30.20.06.002 features an 18mm lug width. This measurement is critical and non-negotiable: it represents the internal spacing between the two lugs where the strap is fitted. A digital calliper positioned between the upper and lower indentations of the case should register precisely 18mm to ensure secure mounting and correct fit.

Alligator leather remains the optimal choice for this yellow gold model. Vegetable-tanned alligator develops a patina that dialogues magnificently with the natural ageing of the gold. Alternatively, Cxl Horween or Tuscan calf offer immediate suppleness and durability, whilst shell cordovan provides structural rigidity with a brilliance that amplifies the warm reflections of the yellow gold case.

Changing the strap on this model requires a specialised tool (spring bar tool) to extract the elastic pin that secures the strap to the lugs. Never force: the spring bar must be extracted with a gentle lever parallel to the wrist. Once the old strap is removed, insert the new one respecting the spring orientation and verify that the lug width matches precisely (18mm). If inexperienced, entrust the task to a qualified watchmaker.

Compatibility depends solely on lug width: if the strap is certified for 18mm, it will be compatible with the 231.50.30.20.06.002 reference. Milano Straps supplies 18mm straps specifically designed for this model. Always verify that the seller specifies the lug width and that your case lugs display no anomalies (some vintage Omega models feature solid lugs requiring personal measurement).

Durability depends on leather quality and daily use. High-quality vegetable-tanned alligator lasts 4-7 years with regular rotation (wearing the same watch 3-4 days weekly); excellent calf resists 3-5 years; shell cordovan exceeds 7 years owing to its natural density. Humid environments, excessive heat and perspiration accelerate ageing. Rotating between two straps significantly extends the accessory's lifespan.