Frost at top of door above door handle, gasket doesn't show damage
The only way for there to be frost at the top of the door would be caused by an air leak in the door seal or the door was not closed properly. You will want to verify the door seal making a good seal.
This is a 70s era frigidaire upright freezer that the door gasket is bad 30 3/4 x 53 1/2. Is there a replacement available?
Answer Hello Matt! The gasket listed for your model is part number ER5307512516. Unfortunately, this item has been discontinued with no further replacements or cross references available and our company is unaware of any other available sources. Sorry about that!