Need help: Ray Ban Clubmaster authenticity check

[tank216]

Bought these from a highly rated eBay seller. They are the Ray Ban 3016 Clubmaster, size 49mm, polarized, black/green lens. I paid $120 for them. Frame seems to be high quality; lens are definitely polarized. Everything seems to be legit.... except for the "RB" etching (see third pic)- it does have texture but doesn't seem to be engraved into the lens, rather just on the surface (my concern is that they're painted on and not engraved) If anyone owns a pair of Clubmasters, especially the polarized version, is this legit and are there other ways to tell? Thanks in advance Note: that's fuzz from the case on the glasses