It's in the 1950 Chevy 1/2-ton project I just bought. Is it original? Seen this type before? Any help you all can give will be great.

http://picasaweb.google.com/lh/photo/58__jU7yrZFuHjAEyA2pcC5gUOnkvy4zzcbIWgQD__A?feat=directlink