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| Hamilton produced a number of grades in the 12 size. In my opinion, the 900 was the best of the lot, although it was not the most expensive. The top of the line from a Hamilton marketing point of view was the 922 Masterpiece. There appear to be two distinct models in the 12 size. The 900 and 920 have a flat click and an open barrel bridge. The 902, 904 and 922 have a circular click and a closed barrel bridge. Hamilton also made several grades of 17J 12 size, but there are none in the collection. |