Part No of Sapphire Crystal on Reference: 311.33.42.50.01.001

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Recently cracked my Omega Speedmaster Reference: 311.33.42.50.01.001 Sapphire Crystal. Cannot figure out what the original Omega replacement part no. is. If anyone can provide some insight it would be much appreciated. Thanks.

PS - Not sure if the crystal is the same part of a close reference 311.30.42.30.01.006. Not sure why mine is rated 100M (10 bar) water resistance instead of the usual 50M. Not sure if crystal is different in order to achieve this.