Keywind Illinois Watch Co., Miller grade pocket watch with monogrammed coin silver Newport Coin case. No chain. The case is simple silver with a hinged opening on the back that reveals the monogram and keyhole. The monogram reads: M. J. H.
The clockwork was likely bought seperately from the case and fit together by a jeweler.
The inside of the case lid is stamped: "NEWPORT / COIN / 453209" Along the right inside edge is inscribed: "715288 / 42232 / A77871 / A2530 / 34666+ / 16989+ / 738787 / 33366+" The front lid opens on a hinge and is stamped on the edge "32 09" The inner lid that covers the clockwork has a hole for the key. The inside of the lid reads: "3 / 2 / 45320". The case that surrounds the clockwork reads " 32 09" along the rim.
The clockwork itself is brass. It reads: "Miller. / Springfield, Ill. / No. 66744 / Patent Pinion / Adjusted." This model has 15 jewels (compare to 1996.C.612 which has 21 jewels and multiple points of adjustment listed).
Reference:
Clockwork: https://pocketwatchdatabase.com/search/result/illinois/66744