Clock Antique Benzing Brevete Pigeon Homing Race Clock

This us an authentic antique homing pigeon racing clock. It has a capacity for 14 pigeon rings. Made in Germany, probably in the 1920’s . The clock works (oddly enough, you wind up the clock anti clockwise!!!!???) Comes with the clock key. I don’t know how to test mechanism that tracks the pigeon rings. I think a separate key is necessary for that. It also seems to require a special paper roll to record results (perhaps available on eBay; ink pads for this antique model are available on eBay) I have owned it for 30 years. I bought it at an antique store in Amsterdam, when I lived there. I have always had it in my book-case as an interesting unusual object (certainly a conversation piece)