How to tell if a '40 was business or 5 window coupe

[Kube]

Originally Posted by 50fordcoupeman

Is there a way to tell the business coupe from a 5 window coupe? VIN number perhaps?
Thank you in advance.

VIN numbers don't tell much of anything other than an approximate date of manufacture.

If it has a package tray and a solid back rest, it's a coupe.
If it is a business coupe, it'll have a split back rest and a pair of small auxiliary seats directly behind the front seat.
If the interior is absent, there are still tells. Floor pans are different as is the bracing in the rear area - behind the front seat.
If you need photos of the floor(s) and / or bracing, let me know.