62Chevy,
I have my cab and bed mounted so I can take another pix but I have a full shot of the frame.
I will say that I had to clean up the area in that location for the numbers to come up. There was the usual rust, dirt and grime. I wont guarantee it, but if you take a wire wheel and hit all the flat, vertical surfaces you will find it. My frame is a 1991 so thats all I can speak to but by law it will be stamped somewhere on the frame.
Hope this helps.