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Hello all. I am new here and new to pocket watch collecting, but have been researching quite a bit for the last several months.Sangamo Special factory cases came into use with the change from model 9 to model 10 production, and then continued on with model 13 production and until the end. The first serial number for a model 10 was 3178901. There is only one model 9 run past this serial number, a 21 jewel run at serials 3251001-3251400. So besides these 400 watches in this run I would say a Sangamo Special case would be expected for any Sangamo Specials at 3.178 million and above, and would not be expected for any watch under 3.178 million serial number.
i believe it is so....I was wondering if the above quote about ALL model 10’s being factory cased is completely accurate.
Here is my model 10 in the original case I believe all the dials were also single sunk to fit the thinner case.The factory case feature was to take advantage of the one feature of the model 10 movement,
the Model 10 movement is about .5mm thinner than the model 9 and later movements....