Case marked A9 on the case back. Inside marked Bulova, Fifth Avenue, New York., 10kt rolled gold plate. The case has swivel lugs . Movement is a caliber 8AE 17 jewels and marked A9. Measures 21.50mm less crown by 41.00mm lug to lug, small in width. Looks like the previous owner had his initial engraved in the center inside of the crystal. Unknown model.
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Square crystal with initial F engraved on the inside