2 in existence, 1 sale for a span of over a year.

https://backpack.tf/item/3185854828

http://backpack.tf/item/3167340841

Looking at these histories last trade (apart from mine) has been longer than a year ago.

Sale

http://backpack.tf/profiles/76561197994660517#!/compare/1482451200/1482537600

Sold for DBD Vintage Tyrolean (50 keys) + Strange Grim Tweeter (4.5 keys) + Haunted Hat (1.3 keys) + Strange Space Diver (~0.28 keys) + Strange Pestering Jester (~0.69 keys) + Flower Power Shotgun FN (~0.50 keys on SCM)

50 + 4.5 + 1.3 + 0.28 + 0.69 + 0.5 = ~57.27 keys, rounding to 57

Trade: http://i.imgur.com/SkukcfN.png

This is a keeper.