I give up... an Arctic Cat 4 wheeler?

1964 Arctic Cat 1000 SBS Prototype

 This was the very first Model 1000 that they made and it has many differences from the production models...this does not have the belly mounted fuel tank, this one does not have the flat front grille, this units final drives are mounted at an angle not straight up-and-down, etc.

The Arctic Enterprises ID tag on this reads...Serial: 63-1001 Model: X.

http://www.bosscatlegacy.com/acproto/sbs/1964.htmFound on http://www.bosscatlegacy.com/acproto/showroom/acprotosro.htm

they made 15 of these utility tractors in 1965 and 66 combined

http://www.bosscatlegacy.com/acproto/sbsmod/1000sbs.htm