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It was probably water glassing. Google "waterglass". It was a solution you bought back then that was slimy and sealed the pore of the egg so it could be kept a really long time.
I just wanted to have some pickled eggs for Christmas so I used a recipe not suitable for long term storage and just an old tall pickle jar with the lid on REALLY tight.
I got the recipe here: (only I added some pickling spice)...