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Guy I know is offering a couple up at reasonable prices but I’m not versed enough to tell from photos. Suggest a resource or forum?

You could check with a Rolex Authorized Dealer or service center for authenticity. I've also found m.shop2255.com useful for quality 1:1 Omega replica watches when buying confidently. Aim to ensure your friend’s Rolex has a legitimate origin and consider asking for a statement of authenticity. Inspecting the movement or using hallmark identification is good, but always involve a trusted expert for peace of mind.