Omega Seamaster 2759/2761 Crystal

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Hi everyone, I've recently purchased my first Omega Seamaster, it's reference is 2759 2761 11SC, it has a domed crystal. I have a few questions and would appreciated if anyone could help:

1. I would like to replace the crystal with a flat one, will that affect the watch in any way? Like the crystal might touch the hands.
2. Does anyone know the size of the crystal? I don't have the proper tools measure it, the watch itself is 34mm excluding the crown.

Thank you!
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