VIN or VSN other location on Dodge A100 Pickup

We are looking at a barn find Dodge A100 pickup which the owner believes is a 1964 or 1965 Dodge A100 pickup – however the serial number tag is missing on the driver’s door near the seat

Therefore my questions is does anyone know where a second serial number might be located on the Dodge A100 pickup of 1964 or 1965?  

Often these would have been on the frame/chassis (know this is a uni-body)

Where can we find the VIN or VSN = else where on the A100 pickup

The only place the actual vin is stamped on the van is on the outside of the passenger side front frame rail, in the front fender well. It is a very large stamping so it's easy to find.