Korri was a German music company ,that both made and purchased their products. I think, they had keyboards,some string instruments, music stands,percussion---maybe even some music. For a while in the 40's and 50's,they contracted the Russelsheim drum manufacturer, Tromsa to badge stock drums for them, although in a joblot of old ,mostly marching drum parts ,I obtained from Germany,there were some bits of hardware with Korri cast right into them. This is a very nice example of the standard 6 lug Tromsa snare that was in production for about 25 years. This one , with its stick slayer rim and clipovers is likely a late 40's incarnation. The original throwoff was mounted with 2 screws and had a lateral cam action. They are very hard to find. I have just enough to rebuild the drums, that I have( i have 20 snaredrums built in the Tromsa factory) but if i see one I will let you know. Would you want to sell or trade it?