[Identify] Can you please identify if this is a genuine Omega 268 and its value?

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Hello! Merry Christmas to you! I am looking to buy this vintage watch. Its a hand-winding cal 268. The seller affirms that it is all original, though the crown is unsigned

Can you please confirm if its a genuine Omega dial (assuming that the movement is original)? It would be great if you can give me a ball park figure in terms of its value. TIA!