Step-by-step: how to remove and change the strap or bracelet on an Omega Seamaster, Speedmaster, Aqua Terra or Omega x Swatch MoonSwatch, the tools you need, and how to avoid scratching the lugs.
How to adjust an Omega Seamaster or Speedmaster bracelet at home: screws vs pins, which screwdriver to use, how many links to remove, micro-adjustment on the clasp, and when to let a boutique do it.
Rubber, steel, leather or fabric for your Omega Seamaster Diver 300M, Planet Ocean or Aqua Terra — the 20–22mm sizing and how to fit and care for each.
Leather, steel, NATO fabric or rubber for your Omega Speedmaster — the 20mm sizing, the space-programme history, and how to fit and care for each.
Updated October 2026 · By the BGStraps team Quick answer: most Omega watches take a 20mm or 21mm strap. The Speedmaster Professional and the 42mm Seamaster Diver 300M take 20mm, while the 43.5mm Planet Ocean…