niles come in different forms, some are all silkscreened in green, some have the exp. printed in different colored ink, some have green rings, some don't, vials are often different sizes... etc.
Woops sorry about that, After looking in the pic forum myself the they do have printed an screened exp/lot #'s and dates ( depends on the batch I guess)...... Although I only have experience with the ones with silkscreening they were good!!!!!! . In fact the three seperate times I have gotten these they were different lots and all were silkscreened!!!!!!!!
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