I read somewhere else on the forum that Omega now sells 21mm exact spec NATOs. Whereas old style was between the sizes (21.5mm). When I picked up my new 300MC from an OB a few weeks ago I was given 21.5mm strap gratis. When I later enquired about buying another NATO I was shown one marked 21mm, which seems to line up with this.
I find the 21.5mm fits fine but it does create some minor friction while threading through the bars. It could fray if you're a frequent strap-changer. If possible I'd prefer an exact 21mm for this reason on a future purchase (assuming this is possible and it isn't simply a case of Omega changing the label on the strap wrapper!). For £140 an exact fit would be my expectation....
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