Hi Stephen: We had the same thoughts. Last 16 March 2009 I send some emails to this ebaY seller asking the same question: the possibility to manufacture the bezel (or insert) for the Autavia 2446C GMT (1-24h not even numbers). The answer was the same: asking me for the inner and outside diameters, and I haven't the instruments to measure with precision the diameters.
I'm very interested in the possibility to find a new insert or a new bezel for my 2446C GMT because it's more fadded than yours.Two years ago I missed a NOS complet bezel in ebaY auction for 10$ difference with the winner.
I will follow the progression of this subject.
Thanks and best regards.
Toni

P.S. excuse my poor english