Dennis, thanks for posting your GB Grand Sonnerie Vienna that was made at the GB Braunau, Bohemia factory about April-May 1906 based on the movement serial number. Pleased to see you have found a supplier for the missing pediment and lower finials, that will certainly give you a complete and well made example. For info, the GB 3-weight grand sonnerie models were only made commercially in the Braunau factory, which had its own set of serial numbers beginning in early 1888 when the factory opened. These numbers, if used for dating from the Karl Kochmann numbers that were for the Freiburg factory, will indicate manufacture from 18 to 25 years earlier than the actual date, and to say the least that causes a lot of confusion. I have posted the actual dating info for both the Freiburg and Braunau factories in THIS POST for everyone's info and personal use.Guys , This is my Gustav Becker Regulator. My first. I found it at a local antique market all wrapped up in plastic. I didn't have much time to look it in detail..price was right so i brought it home. It is missing the crown and bottom finials but all the working parts are there. Please tell me what you know about this clock. Dennis
Your movement is different from the standard grand sonnerie in that it has booster springs mounted on an extension of both the quarter and hour strike winding arbors. This evidently was added to compensate for insufficient weight to drive the quarter and hour strike trains on some clocks. The earliest known example used a movement made in 1890, however it appears this was retrofitted in 1903 prior to introduction of production versions that year. Then, the next examples appear in 1906 and each year afterward through 1912. It is curious why only a relative few clocks were made with this addition, when an obvious solution would be to increase the amount of weight needed to operate the clocks. I have not been able to access enough of these to find out whether GB did increase the weight size on most of their grand sonnerie clocks, since the very large majority do not have these springs. For info they also added a spring on the strike train of some of the 2-weight bim-bam striking models.
I will merge this thread with the main "Post Your Gustav Becker Clocks Here" thread so we won't have any confusion where to go for GB clock info.