Thanks to these forums I know a lot about W Foerster in Berlin, and Heym Patent 60215. I have a drilling brought back from WWI in 1918. W Foerster on 1 side, Berlin on the other. W Foerster on top ribbing between barrels. Heym Patent 60215 underneath so obviously made after 1891. 3 barrels(SxS shotgun, and rifle). 3 triggers. No hammers.
Maybe im not looking in right direction, but how many drillings by Foerster are hammerless? How many had 3 triggers? It seems once they figured out the 3 trigger system, they quickly modified it to just 2 triggers. Any info or direction is appreciated, i cant seem to find many examples that resemble this setup.