Recently aquired this diastar. It's back cover says it's an 8/1 with the earlier half case. Noticed it is different than any I've seen. The bezel has a sharper slope and has a very narrow flat area around the crystal? It's powered by an as1862/63, 1876 stamped under the balance. No reference number on the back, just a number 829017 which I believe is a case number. Anyone else have one or info?Click image for larger version. 

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