Hi all, have found a Speemaster 321 Dial in my spareparts, which I have purchased 10 years ago with many other watches/watchparts from a retired watchmaker in Prague. I had this Dial listed in Ebay, but after a very constructive discussion with the buyer we have decided to cancel the transaction. My hope is, that the experts in this forum can give me some insights/history about this Dial and the manufacturer. The dial has a CB or EB engraving (so it is not Singer) on the backplate and is clearly a Tritium Dial, where nearly all of the tritium has vanished - only some spots are left. Any help and hints are very much appreciated, so I can add those details when I relist the Dial. Thanks!