Thank you for your informative reply neetstuf-4-u, I do appreciate it!
Sadly the crystal has a pressure fracture from an impact. The intended new owner probably wouldn't notice but the trouble is that it may be a moisture ingress point or allow the crystal to loosen rapidly with use. Thankfully I can do the replacement work and the service work myself. Most of my expertise are in Japanese vintage watches so I don't have much in the way of resources for identifying and locating this Bulova crystal. I have been reviewing the GS catalog and I think I have found something close. I believe I need to remove the crystal to get proper measurements before making a blind commitment to a generic. If I can figure out the actual Bulova crystal part number then I think I'll be ahead as I can hopefully just use a cross reference guide to find the solution.
