Just bring it by and I'll take care of it for you!
I know that in the teens and 20s, the frames were worth more and had the numbers or they used the engine number, but by the 30s the vehicle number may be on the body somewhere.
I just did a search, and found this
http://www.ply33.com/misc/vin

Hope this helps, and if it doesn't I'll still take that sweet truck...er, I mean that hunk of junk with no number off your hands!
I'm going to look thru the rest of that site.