1946 was the first year for Spartan. The front windows on the Spartan Manor lacked the radius in all corners that we see in later trailers. It's an easily identifiable feature that helps set the 1946 Manors apart.
When buying gasket for this window, please allow for a perimeter of 113" for the curb side, 113" for the road side, and 145" for the center.
Tinted version shown in photos.