If you forced me to choose from among the possible explanations, that's what I would plck. But I have no evidence that service dials were missing the "Seamaster" signature any more than original dials. There were definitely Seamasters shipped without the signature, though all the examples I've seen were from earlier decades. (The movement, 19802697, and case, 135.003-62-SC, date this watch to 1962.) I don't know how this could be relevant, but this watch is a Norman Morris import (OXG code).
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