This next Model 1872 example I have not shown before, as my watchmaker just got finished with it. It is 21 jewel American Watch Co. Grade movement SN 1,427,904, out of the fifth short run of twenty AWCo Grade Model 1872 movements. At least by serial number, SN 1,427,904 is the fourth
open face AWCo Grade movement (other than perhaps the Charles vander Woerd experimental movement), one of a total of 180 open face "gold dome" Model 1872 movements, referring to the raised gold section of the balance cock surrounding the upper balance jewel setting. However, this movement has bright nickel finish, an unusually early combination with a gold dome, suggesting that it was completed somewhat later than it was begun. 21 jewel AWCo Grade hunting case Movement SN 2,605,261, which lacks the gold dome, has virtually the same sublime damaskeening pattern. The Fifth Run of open face 21 jewel AWCo Grade Model 1872 movements exemplified by the movement shown here was the final run to feature an Old English style black-inlaid signature engraved on the top plate. The AWCo box-hinged case contains 55 pennyweights of 18K gold. I am not usually that partial to box-hinged cases, but I am delighted with this one. The style of Old English "A. W. Co." glass enamel dial, which succeeded the earlier three-line signature style, is combined on this watch with elegant Breguet "moon style" hands. By this Fifth Run of AWCo Grade Model 1872 movements most examples featured winding wheels with bevelled edges, but this feature may have debuted sporadically as early as the Third Run. (Serial number order and completion date order do not perfectly coincide.)
Like the hunting case Third Run of AWCo Grade Model 1872's at SN 999,901, the twenty movements of the open face Fifth Run at SN 1,427,901 advertise Charles vander Woerd's middle temperature compensating sawtooth balance on their top plates. However, no example from this short open face run is actually known originally to have had such a balance. The dial plates also exhibit the much more common "Woerd's Patents" marking associated with other features of the movements.
A long-time friend of mine graciously agreed to sell me this watch recently. I'm guessing it had been in his collection for at least 25 years. After my watchmaker was done with it, it gained fewer than 5 seconds in 36 hours.