Mikrolisk shows the Montrose name as having been used by D. Gruen, Cincinatti - Schild, Swiss - S P Myers, Montreal - and P R Myers, New York. Gruen and Schild were watch manufacturers, and both Myers were (I suspect) distributors. Was your watch actually made by Gruen, or possibly Schild, it is hard to say without seeing what is inside the case. In short, your watch is a private label which generally means generic, or off the shelf.
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