Appears to be basically the well known and well thought of Model 200 series gun, built over a number of years. The engraving pattern is just a bit different than examples I have owned, but otherwise appears the same. Good, well made, sturdy, popular guns. The next step "up" from Gebruder Merkel was their 201 series, which were the same basic gun with more engraving and better wood. I have one of those still in my collection, a "Luxus" grade 201 from after the war period. Not sure what the Hagen marking means, perhaps Raimey's never ending research will find something.