This stiff PVC plastic strip sheds water and helps hold the glass into the frame on Hehr Hall-Mark 12 windows.

Your window may have a rubber glazing strip that has shrunk from the corners. This strip replaces either the stiff plastic or rubber versions, in most cases.

The Hall-Mark 12 awning-style window was generally used by Airstream in model years 1961-1965 only. That's not to say that you definitely have this style window on your early 1960s Airstream, but that it is likely and that if you have a 1966 Airstream you definitely do not have this strip.

A stationary form of the window was used in some mid-60s Serro Scotty trailers, too. Other brands may have used this window. For instance, one customer with a 1973 Chinook reports this type of window. Please let us know if you know of other brands.

If you own a 1958-1960 Airstream, you probably use a rubber strip with a similar but slightly different profile for a window called the Hehr Clearview. We sell that glazing strip, too.  Look very carefully because Airstream was not consistent and we have seen at least one 1960 Airstream with the Hallmark 12. 

This extrusion is a Vintage Trailer Supply exclusive. It is made of PVC plastic like the original. 

We also cary the glazing tape used to bed the glass in the frame. And if your window is the awning style, you will need the bulb seal for the backframe.