This is the freewheel from my old single speed. This is the chromed version of this freewheel; it has 17 teeth. This freewheel is BSC/ISO threaded, and has 17 teeth. The production code is XI, which I believe is from 1999. In any case, this freewheel is smooth and in nice clean condition. There is almost no wear. I broke the hub on the bike early on and this has basically been sitting in storage. I have uploaded large detailed photos. Please take a look. Thanks!