Bulova 1953 Sea King

Appears to be a 1953 Bulova Sea King "A" with replaced wriststrap.  Watch has been serviced with date of movement noted along with jewel count.  Unfortunately they did not notate the movement model, and I feel uncomfortable opening this one up (as I do with most of these waterproof cases).  Crown is marked Bulova and appears original. Dial and hands are immaculate. Some chipping to bezel ring. Otherwise nice working example. Known specs match this 1953 watch noted here:https://mybulova.com/watches/1953-sea-king-8719   with a slightly earlier case serial number.  And matches the specs in this 1955 ad: https://www.mybulova.com/sites/default/files/vintage_ads/bulova-ad-1955…