I'm looking to replace a crystal on a watch which is as of yet unidentified. The crystal is 17.6mm x 21.0mm. The crystal is beveled. There are two vertical bevels running from top to bottom on the crystal. The watch may be a mix of parts, so if we can't match the bevel, that's not a dealbreaker. At this point, I'd just like to locate a correctly sized alternative. A decent picture of what I'm trying to replace is available here:
http://www.mybulova.com/watches/1941-unknown-5689
Thanks much!