Question about 67 SWB frame

[dave6672]

I bought this 67 about two years ago and am just now working on it. I noticed a number stamped on the frame that clearly appears to have a 1979 date. This stamp is located on the side of the frame right under the driver’s door. Does anybody recognize this type of stamp in this area? I’m not familiar with square body frames so could the truck have been framed swapped years ago with a 1979 frame?

Both of my 72’s have the VIN stamped on the frame of the driver’s side near the steering box. Did 67’s have the VIN stamped there as well? Mine has nothing stamped in that location.

My VIN number on door jam plate and SPID match each other and the truck’s options match the SPID. However the VIN plate does not have rosette rivets. Did 67 models use those? Just curious.

Thanks for all input!