That watch is an Omega Dynamic which is a front loader, so there is no back to remove. If you were to take the watch to a watchmaker to have photos taken of the inside case back and the movement, choose the watchmaker carefully. And you might find yourself spending some money to do this. Can you give us better photos of any stampings there might be in the hinge components of the buckle. There might be a clue there as to what you have.
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