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There are more prefixes and ranges yet to be completed for these and other case manufactures. This table has 3 manufacturers listed - Gruen, Keystone, and Star.

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This has been great for the community as more running Gruens are entering the market daily.Decoding Gruen case and movement serial numbers has been a multi-year, team effort.I want to thank Barry "Bazzab" Cooper, Bernd "Barney" Riemann, and Cathy Orbista for their significant contributions to the project.While not completed, there has been significant progress this year for Gruen, Keystone, and Star manufactured cases.Prior to this table there was only Wadsworth serial numbers that had been decoded.

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