Copper Cookware ID Help
Don't get me wrong, you can cook in them. It's just that the copper is so thin it won't be the greatest performer.
The colander doesn't need to be thick, so who cares?
I have no clue as to the maker of the pan you showed most lately. The fact that the maker had to stamp those rings into the bottom is a dead giveaway that it is *very* thin metal--thay do that to add stiffness.
ODI must have customers who spend good money on their pans, so I'm sure someone will buy them if you resell. I can't wrap my brain around using them strictly as wallhangers, but hey, I'm spoiled.