I don't think he's claiming it's actually "medieval" age/antique. For the price, getting a full mail shirt, coif, helmet, gauntlets, and breast and back .. isn't a terrible price. It's probably about what it retails for, but maybe he did pay more than that. The mail shirt I gave you with the extra rings is a butted, mild shirt; they're around $120 on eBay right now. I paid about $500 for it back in the mid/late 90s before the indian "armories" started getting up in full swing and cranking out lots of cheap stuff quickly. Hard to guess what he paid for that armor; it looks like an Armet/Close helmet, and even the cheap indian knockoffs I've seen are $300ish. What's in the listing that looks wrong/misleading?
(the listing might be edited from the original, so I'm just going off what I see on there now...)