The gen is 31.8mm. That is what the 318 means in the part number
https://forum.replica-watch.info/fo...-milgauss-green-sapphire-crystal-b25-318-1-c1
That measurement is taken on the lower part of the crystal edge, where the smaller diameter of the stairstep profile is. So if the ARF is really 32.7mm, it would seem that it is a straight edge profile with the same upper diameter as the gen. This is typical of some rep crystals - they look the same on top as the gen but are cheaper to make than the meticulously cut indentations of the gen or gen-spec edge. These two different types of edges would be interchangeable only if a second gasket is used as I showed previously. The second gasket just fills up the space in the lower crystal detent.
