Help finding the correct crystal for ref. 111.046 (cal. 620)

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Hello!
I hope everyone had a wonderful Christmas!
I'm looking to replace the crystal on my newly acquired watch - a vintage 1960s Omega with reference number 111.046 (caliber 620), as it has an obvious crack. I haven't found much information here, except for two threads with limited details. The watch has a 31mm diameter.
Does anyone know where I can find a replacement crystal for this model, and what exact crystal type I should look for?
Any help is very much appreciated. Thank you!

 
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Call any parts supplier and give the case reference number on inside case back which is 111.046 and caliber number

Should have both OEM or generic

Can try Jules Borel, Otto Frei or William S. McCaw in the US

Cousins if in the UK or around
 
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DON DON
Call any parts supplier and give the case reference number on inside case back which is 111.046 and caliber number

Should have both OEM or generic

Can try Jules Borel, Otto Frei or William S. McCaw in the US

Cousins if in the UK or around
Hi DON!
Will try Cousins in the UK, as I'm located in the EU (Austria).
Many thanks!!