This drilling is purported as having D.R.G.M. 242486 on the tubeset, has a Roux underlever and is in the 30k serial range. G.C.Dornheim's D.R.G.M. 223532 for the 8.15X40R dates to 1904 while Vierordt's DRGM 274380 for the 8x62R should date to say 1906 as would the Kersten Modell I under D.R.G.M. 252511. So Gebrauchsmuster 242486 would date to circa 1905(just some ground truth and not related other than a date, Ernst Steigleder sought protection under DRGM Nr. 232449 on July 20th 1904 for a breech-block mechanism). So a date range for this drilling is 1905 - 1908. T&S seemed to be rolling out quite a few per year so if yours is 22k and if the production numbers approached say 800 per year, then it would date to 1895 - 1898 or the late 1890s.
Kind Regards,
Raimey
rse
