Again, you are now looking at a totally different "Frigidaire" than who they were in the 1950s. Frigidaire is now just a brand name for Electrolux appliances from Sweden, so of course they have a 230V 50Hz compatible version now. That has no relationship to what Frigidaire was or what they made in the 1950s when they were part of General Motors. From everything I've ever seen of US manufacturers making products like appliances in the 50s and 60s, they had no interest in markets outside of the US.
I think that your earlier assertion about the unit being a commercial animal of some sort is also a strong possibility, but until the op sees the plate, ( or someone who worked for the refrigeration/appliance division of the GM conglomerate at that time steps forward
) we cannot know for sure.
Remember that there was a lot of rebuilding going on in Europe- could have been something special for specific use over there by some of our guys stationed over there for the US backed rebuilding programs, anything.
so how is that old item a 240vac item when US was making everything for 120vac 60Hz. are you saying its a 240vac 60Hz item? and even if it were made for 50Hz, the built-like-lead aspect would likely survive ok running on 240vac 60Hz.
Whether the unit would work well is, imo, irrelevant as it probably shouldn't be installed
anywhere- its over a half century old and there might not even be any type of an egc present. This is on top of the inefficiency issues mentioned by Jraef above. If there is a case of someone who wants something like this, there are plenty of niche outfits online who sell reconditioned (or will rebuild) vintage (and retro fitted with an egc to the case/ 5-15 plug) '50s and '60s appliances who can satisfy their nostalgia.
