Size is correct but these crystals use also teflon tension ring to fix the crystal into the case. The outer size, thus the opening in the case is 320. I have teflon rings wich I have to use with crystal size of 319...so the crystal of these 11630 Autavia's is obviously never 320 but always something less (depending on the thickness of the teflon tension ring ofcourse).

Cheers,
Abel.
: 11630 is 32 mm x 3 mm

: ape aka www.heuerautavia.com

: pasadena I can measure this evening when i am at the safe