By looking at the pics you provided , I can see that it has the takedown screw and the later style exposed locking bolt . This makes it a third model 1890 . Your serial # provided indicates that it was manufactured in 1919 . Great find ! How's the bore look ? Is it a .22 short , long , LR or .22 WRF ? I've got five of these little beauties and they are a simple but very high quality rifle . A blast to shoot [ I usually use a standard velocity round or a sub-sonic depending on the shape of the rifle ] . Hope this helps .