Omega magnifier lens - profile and logo?

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Omega has magnifier lens available for some sizes. I recently had one installed for a 168.022. My watchmaker said clearly it was an Omega crystal (including the hefty premium) however it does not have the typical Omega logo in the center. It also has a flatter profile (though not flat), with a chamfered edge around the perimeter. It replaced a non-magnifier crystal with a similar profile and no logo. Any thoughts? Wondering if this specific series crystal did not include an Omega logo, at least in later versions.

Thanks --
 
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Omega glasses from this era were all branded with the logo in the center.
 
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Got that, but what about a replacement crystal (of unknown age)?
 
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Do you happen to know the Omega Part number for the crystal that was installed? I am looking for a similar crystal for a 168.022 / 166.028
 
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Do you happen to know the Omega Part number for the crystal that was installed? I am looking for a similar crystal for a 168.022 / 166.028

063PZ5106L