I have just bought my first Autavia; a 11630 Viceroy. It's totally original and in good condition with the exception of a number of surface scratches on the crystal and a missing lume dot in the Tachy bezel. My query is about the crystal - is it a normal flat, mineral crystal, available from any material house, such as Cousins UK, or is a replacement difficult to source? Also, what was the missing lume dot? Is it difficult to replace or would it be best left alone? The bezel insert is otherwise in good shape, without any significant damage and is original, so maybe would be best left alone?? Any advice would be appreciated.