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I use nail polish for end labels and Krylon Preserve It for back labels. It is a spray on document protector and seems to be working well on a few I have the past 4 or 5 years.

That is the real McCoy.

In general the labels that don't have the JG Escher name or sig on them will have a picture of a cup with E&Co. on it. Here is a thread that Hatzicho posted awhile back with pix of that sort of...