Can anyone identify this watch for me please it was my great grandfather’s.

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If you have got a case back winder and can open the back of the watch it will help. Obviously the condition of the front of the watch is making it difficult to see the dial.

If you cannot take the back off, would recommend that you get a watch specialist to do so and take some photos. The model reference is normally stamped on the inside of the case back
 
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It´s an Omega goldfilled bumper automatic watch ca 1952. It feels that something is loose inside, but it´s the way it shall be. Seems to be in decent condition, even if it has obviously been exposed to moisture. On this one I should consider a redial
 
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On this one I should consider a redial
I tend to agree, and that means a factory restoration, in Bienne, CH.

The bracelet is Fixoflex, aftermarket, but they're still around. One of the better ones to adjust for length.