Here are two OEM Vent Windows & Frames that came out of 1948 F1.

I have both the left and right side.  The driver side glass is in good shape with no chips or cracks. 
The glass frame has a little surface rust but a sanding and some paint will make it look new.
The passinger side glass is the same as the driver side.  The frame just needs paint also and it still has
the vent lever attached.  The lever has no rust that I can see with a couple small dings.  A good cleaning
and this to will shine. 

Both window pivot free and easy.  The rubber molding is shot and should be replaced and there is some
rust on the frame that needs sealed, but it will not show when installed.  A great addition to any restoration
project or driver.