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In about May 1925 GB stopped using their traditional consecutive serial numbering system that included all types of clocks except for their pendulum alarm clocks (1876-1914). They also ceased using the circular GB anchor logo and the Medaille d'Or at the same time. Only the GB anchor logo or Gustav Becker name is found on clocks made after the change. It isn't known why this was done, however GB had just completed the 25th anniversary of the 1899 Vereinigte Freiburger Uhrenfabriken (VFU) merger and it could be the seven-digit numbers were becoming cumbersom. The new serial numbering system started with the number "1", but this was used simultaneously for at least four different types of clocks. Thus we find a multiple number of clocks of different types with duplicated serial numbers. This new system was applied to 400-Day clocks, spring driven Westminster mantel and wall clocks, some hall clocks, and weight driven wall clocks. The following serial numbers apply ONLY to 400-Day clocks and spring driven Westminster mantel and wall clocks made at the Freiburg factory from 1925.45 through 1932 when the factory was closed:
1925.45: 0001
1926: 0566
1927: 1451
1928: 2201
1929: 2851
1930: 3471
1931: 4071
1932: 4661 to 5000