The more precise dating of these clocks then relies on other features, such as the pendulum hanger. The letter "R" was used for rack strike, in German "Reschen". That is an abbreviation for "Hohltrieben" or lantern pinions in German. For example, if it had lantern pinions, the letter "H" was used. After May 1925 that stamp was no longer used however by that time they were using letters to designate the quality and features of the movements. These movements were first introduced in 1906 and utilized from that time to May 1925 with the SILESIA stamp. The "SILESIA" stamp below the GB anchor logo indicates this is one of their better quality examples, in this instance having solid cut pinions instead of lantern pinions. These movements made at the Freiburg, Silesia factory did not have serial numbers. Kurt and Steven have already provided some useful information, basically showing that the movement in your clock is one of the GB "Amerikaner" style designs. Click to expand.Jevon, welcome to the NAWCC Message Board! Thanks for posting your GB spring regulator clock.
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