Seamaster DeVille Kleerback KL 6292 VB - Back Crystal Reference?

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Hi, I'm trying to find a reference number for the back crystal on the Omega Seamaster DeVille Kleerback KL 6292 VB.

I don't know if the crystal I have is original and want to purchase an original to compare. The crystal I have is unsigned. OD 31mm. ID 29.6mm. Height: 4.6mm. It has a split retention ring.

 
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I've never seen a signed back crystal on these and I've had at least a half dozen pass through my hands over the years.