what does this speedo belong to?

just wondering if anyone knew what this speedometer might belong to.i found it out in my grandpas old shed,and he said i could sell it just need to know what it goes to thanks.
http://i29.tinypic.com/2nqw552.jpg
http://i26.tinypic.com/2rp9nxh.jpg
http://i28.tinypic.com/2luqs11.jpg

Given the odo reads all zeros, I am sure someone will find it useful!

It really looks familiar. I would guess GM from the early to mid '80's, but I am not sure.
I would suggest very politely calling a GM dealer and ask them if the part number on the back is one of theirs.
They might even be able to tell you what it fits, if their records go back far enough.

It might be a Chrysler part, (not sure) but it definitely is NOT a Ford. The part number is wrong for that.

I would guess GM from the early to mid '80's, but I am not sure.
Thats my guess too.
I think it looks like the '82 and '83 S-10 speedo since it had the bewbie shaped lense, but I am sure that wasnt attached to the speedo itself. (on the S-10)