All indications point to this being a 1955 Sea King.
In reply to Awesome! I was pretty sure, by august1410
Nice condition example of a Sea King, 1955.
I'll add my usual quick recommendation here....
The service interval for mechanical watches is 4-6 years. If the watch is left to dry out or run longer than this, the oil will have evaporated and dirt may have accumulated in the mechanism along with dried lubricant residue.
I strongly recommend getting vintage watches serviced if you plan to run them. They can suffer quite a bit of damage by running dry and/or dirty. Even ruby jewels will wear when subject to stress and dirt. Before I became a watchmaker, I managed to destroy an NOS dive watch I got at a Flea market in only three or four months.
A full overhaul ( a CTR in the trade) consists of completely disassembling the movement, and cleaning in Industry Standard Solutions. The individual parts are then examined and faults corrected and parts replaced where necessary. Usually the mainspring is replaced.
The watch is then re-assembled and lubricated, with adjustment and regulation following demagnetisation.
Some places will polish the case and bracelet at this time at no extra charge.