Centenary 2500 Crystal Repair

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I have a Centenary 2500 (Cal.30.10R.A.PC) with an unsigned Hesalite crystal. I'm trying to (a) figure out if it is original and (b) decide if I should polish out the scratches or replace it. Does anyone know if these crystals were signed or did Omega really only start doing that in the 50s?

What are people's general guidance on replacing or polishing vintage crystals?

 
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I would polish out that crystal for the time being while awaiting guidance from the Forum knowledgeable about original Centenary crystals.

I am envious of your Centenary. It is a watch that appeals to me.
 
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I would start with a polish of the crystal in any case, especially if the scratches are relatively small.