This a Kershaw knife that was made for the Snap-On tool Company (Note the pocket clip shaped like a wrench). If I remember right it was called the "Chubby"...I sure don't know/remember the model number.
Correct Brad! You know your Kershaw! It is indeed the Kersahw 1440C Chubby (Cammo). It also came in red - Kershaw 1440 Chubby (Red). The Snap-on models were made in Japan. After the run with Snap-On ended it seems Kershaw modified it a bit keeping the wrench shaped clip and called it the Half Ton. The country of origin now China. Both are nice, but I have to say I love my Chubbies. (keep your minds out of the gutter)