Thanks everyone for your replies.
How big is that compressor? How big is the whole cooler?
The compressor has a diameter of approximately 9 3/4". The cooler's approximate outside dimensions are 22" W x 14" D (excluding the radiator) x 19" H. The radiator is around 13" x 13.5". The cooler's inside dimensions (the deeper section) are 11 3/4" x 10" x 14"H. The "shelf" is 6" x 10" x 2 3/4"H.
It doesn't have any labels anywhere besides the Kold Pak one in the front. The thermostat is a Ranco Type RJ. The compressor says "Made in U.S. of America" and is stamped with numbers. I've attached photos where they are visible. There aren't any other markings/badges/etc. anywhere. Based off of the compressor, approximately what year do you think it is?
Do NOT try to disassemble the liner from the outside shell the secret about this cooler is it used the refrigeration to chill a core of “ blue ice” gel ( yes just like the “blue ice“ freezer ice pacs you buy for your modern picnic coolers! )
Thank you for the response, this was interesting to read. The lid is in bad shape; I tried to sand the rusty areas a bit and the rust is quite deep and it there is pitting. I have a friend who has a small business using blasting with water; in order to clean the rust off well I'll need to take it apart so now I'm concerned on how to go about this if I can't dissemble the liner from the outside shell.