Omega · 19, 20 and 21 mm
Watch straps for the Omega Speedmaster — the chronograph that went to the Moon
On the Speedmaster, the case decides, not the name on the dial. The 42 mm Moonwatch takes 20 mm between the lugs; the 39.7 mm cases, those of the first Speedmasters and their re-editions, 19 mm; the 44.25 mm Moonphase, 21 mm. Check the diameter of yours first, then choose the leather.
The three lug widths, at actual size
Hold your Speedmaster against the screen: the distance between the lugs is drawn at real scale, one millimetre is one millimetre. The 21 mm is recognised by the 44 mm case; between 19 and 20 the diameter decides, 39.7 or 42.
Your watch with our straps
Pick the size above, then the leather: the watch and the straps change. Real photos of the strap, nothing generated.
Grand Cavalier Leather Strap Orange
91 of 91 straps in this size, 74 with a mounted photo. · Real photos of the strap and the case. No generated images.
Which lug width your Speedmaster Moonwatch has
Seventy years, three sizes. Read between the lugs at 12 o’clock, strap off.
since 1957
9 references
The first Speedmasters and the 39.7 mm re-editions.
Moonwatch, 42 mm
152 references
The case that went to the Moon in 1969.
Moonphase, 44.25 mm
2 references
The largest case, with the moon phases.
What people ask me about the Speedmaster
Four questions, the same for twenty years.
What lug width does my Speedmaster take?
The 42 mm Moonwatch Professional takes 20 mm between the lugs. The 39.7 mm cases take 19 mm; the 44.25 mm Moonphase, 21 mm. If you are not sure, measure between the lugs at 12 o'clock with the watch strap removed.
Can the metal bracelet be removed and replaced with a leather watch strap?
Yes. On the Moonwatch the lugs are not drilled: the spring bar is released from the inside with the forked tool, between the case and the bracelet. Work slowly, with a cloth underneath, because the case marks easily. If you prefer, I do it in the workshop.
Which watch strap suits a chronograph like the Speedmaster?
A full-thickness calf leather watch strap: the Moonwatch case is almost 14 mm high, and a thin strap makes it look heavier than it is. For everyday wear, a nylon NATO watch strap also works well.
Which watch strap do you recommend for the Speedmaster?
A 20 mm brown vintage calf leather watch strap: on the black dial, brown softens the look without changing the character of the watch. For summer, a green NATO watch strap. If you would like something built on your wrist, the Casati atelier.
Chosen for the Speedmaster
Six 20 mm watch straps I fit most often on this watch.
“A well-made watch strap should not surprise, it should last. On a chronograph worn every day, even more so.”
For a Speedmaster with a history, the Casati Milano atelier at Via XX Settembre 15 makes a watch strap to measure, in person or by video call. We start from the wrist, not from the catalogue.