UPDATED NOV. 25, 2014
If you folks will post serial numbers AND which logo (Freiburg or Braunau) is on the clocks I'll provide accurate dating. You can edit the posts already made to include that info. The GB logos previously posted here have been replaced with an updated set, shown here with revised approximate dates as well as double the number of logos:
LOGOS FOR FREIBURG, SILESIA FACTORY ©1995-2017 J. S. HUBBY. COPY FOR
PERSONAL USE ONLY.
Additional information and comments for each logo shown, starting upper left and progressing by rows. PLEASE NOTE the overlaps of various logos within given timelines, in some instances several logos were in active use at the same time:
1852 - 1877: GB anchor logo by itself. Documented to have been used within these years, possibly earlier but not later.
1869 - 1877: Same GB anchor logo but includes "GUSTAV BECKER FREIBURG i/S". Predominant logo in these years.
1875 - 1896: Medaille d'Or awarded August 1875, circular GB Freiburg logo introduced same time. Used with Medaille to the left and GB logo to the right from time of introduction to 1896, this was the predominant logo set in this time period.
1883 - 1885: The winged hourglass on world logo was used for a short period as noted.
1877 - 1925: The GB circular logo was moved to the left and Medaille d'Or to the right on some clocks made from 1877. The reverse positions were predominant until 1896 at which time this logo set became predominant until 1925. About mid-year 1925, this logo set was discontinued.
1877 - 1894: A stylized version of the earlier GB anchor logo was introduced in 1877 and used to 1894, found solely on spring driven clocks. Used mainly for the back cover of GB alarm clocks and other novelty clocks.
1887 - 1900: The GB circular Freiburg logo was used by itself primarily on spring driven wall clock movements, perhaps these were not considered of high enough quality to merit the application of the Medaille d'Or.
1894 - 1900: A fancier version of the GB anchor logo having a clock dial in the center of the crown was used on better quality clocks in this period.
1898 - 1899: The "double lion" GB logo was used for about two years. This logo is actually a near-copy of an A. Willmann & Co logo that was used from 1895 - 1899.
1900 - 1906: Another version of the GB anchor logo was introduced in 1900 and only used a short time. Note the clock dial is no longer there, nor any other mark in the center of the This one is found mainly on spring-driven wall clocks that have a strike control countwheel mounted on the back plate.
1908 - 1912: A block letter "GUSTAV GB BECKER" logo in oval form. This logo has been found on both "Amerikaner" and solid plate design movements within this period.
1906 - 1925: Another and fancier GB anchor logo with a wide crown and what appears to be a crescent moon in the center that was used only for "Amerikaner" design movements. The word SILESIA is stamped below the logo, indicating this movement has solid cut pinions and other features that were 'superior' to the competition.
1914 - 1934: The same fancy GB anchor logo as for the previously described version but without the SILESIA stamp. This version was introduced in 1914 when GB finally started making their "Amerikaner" movements with lantern pinions. This logo was used exclusively for Amerikaner movements to around 1922 when it was also used on some wall clock and grandfather clock movements. It was last used for movements made in the Freiburg, Silesia factory up through 1932 with that factory was closed, but has been found in dated clocks as late as 1934 that were assembled by Junghans, using "leftover" Freiburg movements.
1922 - 1932: This simpler version GB anchor logo was first used on GB 400-Day clocks and continued to the end of 1932 when Freiburg production was shut down. It was also used for Westminster chime movements made from 1925 to 1932, some wall clocks with solid plate movements, and grandfather clocks in that same period.
1918 - 1940: The block letter "GUSTAV BECKER GERMANY" logo was used on various clocks made with GB design movements until the Freiburg factory closed at the end of 1932 and then on Junghans or HAC movements sold as Gustav Becker clocks from 1933 to 1940.
1933 - 1940: This very simple and smallest of all GB anchor logos was used on Junghans and HAC movements sold as Gustav Becker clocks from 1933 to 1940
NOTE FOR USERS: These illustrations represent all known GB logos used on movements and for the indicated dates. If others are found they will be added in due course. The dates shown are subject to change as more data is compiled
LOGOS FOR BRAUNAU, BOHEMIA FACTORY ©1995-2017 J. S. HUBBY. COPY FOR
PERSONAL USE ONLY.
1902 - 19??: This circular GB Braunau logo has only been found on two clocks to date, both made in 1902 based on their serial numbers. Additional dates will be added if and when documented.
1888 - 1926: The GB Braunau factory had its own unique set of serial numbers and also some of their own logos, denoted by the addition of "Braunau i. Boehm" around the circle below the GB anchor and Freiburg i. Sch. stamp. This logo set with the GB circular Braunau logo and the Medaille d'Or stamp was used for the entire production period that factory was producing GB clocks.
1913, 1920 - 25: The identical GB fancy anchor with SILESIA stamp logo as described for Freiburg "Amerikaner" clocks was also used for "Amerikaner" clocks finished in the GB Braunau, Bohemia factory. Evidently the movements were made in Frieburg and stamped with the logo but finished and stamped with a Braunau serial number at that factory. They have been documented to have been made in 1913, then from 1920 to 1925. Also, these movements were a higher quality than the Freiburg version, having Graham deadbeat escapement as well as solid cut pinions and solid plates front and back.
1918 - 1926: The "MADE IN TSCHECHOSLOVAKIA" stamp was placed on most movements made or finished in Braunau starting just after the WWI armistice in November 1918 and continued in use until GB clock production ceased in 1926. NOTE that present evidence indicates the Braunau factory continued to assemble GB clocks using Freiburg movements from 1926 and continuing to 1932 but did not manufacture any clocks. After 1932 that factory was then owned by Junghans and converted to assembly of Junghans clocks until the beginning of WWII.
Thanks to all for helping nail down even better when these clocks were made!
John Hubby