C. 1955 Omega Automatic Seamaster

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Going through my grandfather’s effects and found this vintage watch. It was bought in 1955 in Japan, but I have no other information. Could anyone tell me anything about it? What model it might be or anything else? Thank you!
 
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Looks like a 2576 fat lug bumper but the way to be sure is to pop the back, well unscrew it, and read what is inside. It’s suffered some water damage maybe so might not be all that clean inside. Its charming all the same.
 
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Nice watch, congrats!
Unscrew the case back, that should tell alot, in the photo it looks like a 2576 with a bumper mvmt Cal 344, from the early 50s.
 
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A watchmaker can open it for you, or you can use a rubber ball or Kong dog toy to unscrew it with friction - do a site search here for instructions, my phone is not copying links for some reason today. Do not use pliers or scissors etc