My two cents worth!
You can believe this or not!but, the Westinghouses of the early 50s that say Colder Cold, will keep ice cream as hard as a newer fridge with a seperate freezer compartment, I had a 50 Frigidaire and my cousin had a 56 Hotpoint, both single door boxes and they would NOT! keep ice cream unless you put it in a glass or metal container, my Grandmothers 50 Westinghouse kept it hard as a brick, go figure! As to the 60s Frigidaires, ANYTHING frost free will naturally give more trouble, personally, I had a 63 Imperial 16 foot bottom freezer in turquoise and it was ok, but once in a while the fridge temp fluxuated because of that thermostatic duct thing sticking, I got tired of hearing the defrost timer squeal, so a friend in Rockingham has it now, but the meter misers do get more noisy with age where as a Westinghouse or GE stays nearly silent, John L. What do you say, you are the expert.