1954 Bulova Mermaid 'A'
Case looks to be a base metal with plating, as it shows some wear thru; caseback is stainless steel with no datecode; inside is stamped RP Germany and Bulova Watch Co Inc. White dial with radium hands, center sweep second hand in blue. 17-Jewel manual-wind 6BMC Swiss movement dated L4.
Pricelists show several variants A thru F; only A and C at the $49.50 price; the A in this 1955 Ad looks to show number 6773, which according to the 1955 pricelist is the 'A' variant. Another 1955 ad matches the case, but not the dial (3,6,9,12 vs even numbers on subj watch); and the C is a completely different style.