wow thats an interesting fridge and it looks like you are sitting on a collectors item.   When I repainted Grans fridge all those years ago I stripped it back to bare metal with paint stripper, etch primed and resprayed with auto enamel with the added catalyst that made it harder.   These days you have all the great two packs that duplicate the original baked enamel finishes really well

that fridge is missing a few things, freezer door etc. the date is wrong, and its handpainted i think.

i'm going for the original colours .. a yellow, like the enamel on bread-bins . someone locally does rods and is willing to prep and paint it at a price (my gear is past it) and they do good work so.. i'll either take it up there or sell it as it is ,, you see i want to buy a shop bottle fridge designed /manufactured by my father that's for sale near here.and i dont have room for both of them ;\