This is an antique pocket watch movement from American Watch Co. It is the Riverside model, ser. #921874, patent pinion, model 1873, 8 size, 11 jewels. This is the information I found when looking up the movement using the serial #. I'm not well versed in these things, please look it up your self to make sure your info matches what I found, I make no guarantees about the info. The movement isn't running, but the balance moves nicely when movement is given a twist. I scrapped a heavy 18K pocket watch, figuring I won't get more money selling it complete. The watch case # was 80859.