I bought this key at a flea market and can't find anything like it online... Can anyone tell me what model and/or year it's from? It's flat steel, pretty thick, and has the Huf (script) engraving on it but no other numbers or anything. Sorry for the crap picture, it's the best I've got... Help!

http://www.flickr.com/photos/35736961@N08/7827484172/