1890,s fixed gear rear hub. Hub spins great and i have checked the bearings and all is good. Nickel is not great but on an original bike it would look great. 9 tooth sprocket with a 3/16 chain, 36 spoke count. Sprocket is loose so no problem getting it off the hub. I made a new lock ring as the sprocket was missing and also the lock ring. This hub will fit a 4 1/4 drop out or a bit wider with washers. Need more info just ask. Asking 145.00 US. shipped Please just PM me don't post here. Pay pal works for me.