I'd say the 3719 is the inhouse number of the O. Geyger firm in Berlin who sourced the sporting arm from the talented pool of craftsmen of Suhl between 1912 & 1922 with the encircled GS being the tube knitter. One sees the encircled GS on the tubes of many of the Berlin offerings and I hope Baumgarten chimes in to remind me of the ones we've seen recently. Lovely scattergun with hidden, square Greener crossbolt and typical Geyger fences. Many times the inhouse number will be on both sides of the water table. The 11812 is the serial number of the Suhl craftsman where O. Geyger placed the order for the sporting longarm. If you mean the "Crown" over "S" on the tubes, then that notes the tubes were proofed/proved for shot. The tubes are also stamped with the "Sl", being a unknown tube source but the latest preponderance of evidence points to a Belgian tube forge source. The "Sl" seems to be more common on Belgian retailed sporting weapons and my 1st thought is that sourcing from a Belgian tube forge source just increased the profit margins. It is possible that Geyger arranged the transfer of components to Suhl and then had the most apt fellas to file, assemble, etc. I wouldn't doubt among O. Geyger collectors it would realize over $4k U.S. of A.
Kind Regards,
Raimey
rse
