![]() Thé Keystone Standard Wátch Company should nót be confuséd with the Kéystone Watch Case Cómpany, which purchased thé rights to thé E. The 10-size watches were produced in the early 1920s, in 17, 19 and 21-jewel models, and are marked Patd 21.ĭA: 25 PA: 31 MOZ Rank: 56 Keystone Standard Watch Company: History, Serial Numbers. ![]() Noté that the 10-size Keystone-Howard Thin Model used its own serial number list starting at 1001, and cannot be dated using the chart above. ![]() DA: 23 PA: 50 MOZ Rank: 81 Keystone Watch Case Co.ĭA: 12 PA: 28 MOZ Rank: 40 Keystone-Howard Watch Company: History, Serial Numbers. Paul, Simon PhiIlip Peerless Watch Casé Co., Inc. Keystone Watch Case Lookup Serial Numbers Are Unrelated.
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