According to Jim Benjaminson the lower priced P5 was the last Plymouth without vent wings. The upmarket P6 had them.

It is less expensive to use a single pane of glass than to install two in the same space, doubling mechanisms, channels, etc. The P5 and earlier got ventilation by tilting the windshield out at the bottom.

About the coupe: the same body was used from P1 1935 through P6 1938. Yours has been dechromed which hurts identification.

Look in Allpar as well as other resources to determine which one you have. I'm guessing it's a 1938 P5.

R.