Etsy has a great vintage selection, with quite a few mid-century finds. I'm especially fond of this little avian bottle opener from seller Ella Cinders. Check out her shop for more items - not everything is MCM, but this clock and desk lamp are pretty cool.

About:
This cute would-be feathered friend is truly a "form meets functional" classic. It is the perfect shape for opening a bottle with ease and yet has an almost sculptural quality to it. Likely made of rosewood, this lovely is made in Denmark and signed.

Vintage charm and treasure from Ella Cinders - Sweet Mod Tweets Bottle Opener: $34