David, thanks for posting! As can be seen in the GB circular logo, your clock was made at the GB Braunau, Bohemia factory. The "Made in Tschechoslovakia" stamp shows it could not have been made prior to November 11, 1918, the date of signing of the WWI Armistice that created the country of Tschechoslovakia from part of the Austro-Hungarian empire as mentioned earlier. Regarding when your clock was made, there are two possibllities based on others I have documented with very low serial numbers: The first possibility (and IMO what actually happened) is that a limited number of "special edition" clocks were made to celebrate the formation of the new country. At this point yours is the third one with this serial number configuration, the other two are 000010 and 000012. There is at least one report from contemporary trade magazines that factories in Bohemia were prepared to immediately begin marking their goods with the "Made in Tschechoslovakia" stamp to show they were no longer subjugated to the empire. My Braunau data confirm this to be fact, in that the "normal" serial number series clocks were also stamped that way from late 1918 (serial number 815896 is the first with this stamp other than the "specials") and continuing on following the takeover of GB operations by Junghans in late 1925. The Junghans takeover leads to the second possibility. At that time, the traditional GB serial number series was discontinued at both Freiburg and Braunau, and a new series started with no leading zeroes. A major difference also implemented at this time was to use individual number series for different types of clocks for example 400-Day, Westminster chime, Wall weight regulators, some hall clocks, etc. That resulted in duplicate serial numbers between the types . . I have single digit numbers and continuing past 5,000 for 400-Day and Westminster clocks made in Freiburg to confirm this practice, with three duplicate sets to date. For the Braunau factory, I've now documented seven clocks with the low serial numbers, ranging from 10 to 627. NOTE the number "10", it is stamped as such with no leading zeroes. The confirmed practice from Freiburg would strongly point to this clock being one of the post-Junghans production, and the one with the leading zeroes to be a "special". Hopefully we will see more clocks in the future stamped like yours, and even better one with a signed repair date or purchase date or other mark that would confirm the 1918 date. Regarding the case material, I have a number of Braunau box regulators documented that have VERY nice cases of birdseye maple, quarter-sawn birch, and other fine woods. These were made from about 1908 through the mid-20's, most of them with elegant bevel glass doors. A photo of one made in 1920 is attached.