Ben,
The crown U under an eagle is the mark for a definitive proof, using the provisional charge. It does have the crown W, so it is choked( amount of choke not listed, but usually very tight).The Nitro is in block letters, so it was proofed in Suhl. It was likely made in or near Suhl, then. With the bore shown in mm, it was made after 1911. There is no date, so it was made before 1924. I still couldn't see the "cooch", when I tried to magnify it, all I could see were knees and feet.
Mike