I've seen a ton of "vintage" sellers on Etsy, but none of those shops have been quite as excellently curated (nor as MCM minded) as the Sunday Times Market. The husband and wife duo behind the shop are self-described "vintage-aholics and collectors of everything Danish Modern", and it shows.
Aside from their exquisite taste, another thing that stands out (and really sets them apart), is their beautiful product photography. Even if you weren't in the market for a tin helicopter, you're going to buy it because it looks so dang good. But enough talk. Go explore the Sunday Times Market for yourself!
[Also, check out their sweet blog for more vintage-y goodness!]