I think they are Cosmic Alloys, which aren't OEM Lotus but a very popular aftermarket fitting back in the day. My car had steel wheels as bought but the first owner replaced them with 5x13 cosmics very early on in it's life.
I can't remember if the raised sections were polished or painted when new (probably polished ?) but mine were painted silver when I first got them. Here's the 1972 brochure from the company.
Brian