This is not true of the deploy straps. Because of the Omrga clasp design the standard lengths are 105/100, while the short length models are 100/95.
Also for smaller wrists the shorter clasp should be a bit more comfortable. The standard black alligator steal that comes in with the speedmaster sets is a 20mm taper to 16mm at the clasp and a 94521613 standard length omega deploy clasp. The short model of that clasp is 94521633.
This is not an official policy, but rather a common courtesy. Also I'm not sure if Omega makes a short version of the 20/16 alligator strap, but I do know that a 6.5" wrist will either be on the smallest or second to smallest hole. The gator straps also fit smaller than similarly sized rubber/leather/cordura deploy straps, with a larger fit of each strap for standard length increasing respectively.
If you're going to order through an AD they should have a few models available with the standard clasp and strap to try on.
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