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Is there a difference between the L-4 and the L-4E (as shown on the nuggethill scan)?
In the Town & Type listings, the suffix indicates the method used to print the precancel. "E" stands for electrotype, "HS" is a hand stamp, "TS" is typeset, etc. Each local style number exists with only one printing method, as far as I know (although I suppose it would in theory be possible to produce an overprint using the same plate for both typeset and mimeographed overprints, for example). That is to say, if there is an L-4 E, there will be no L-4 HS, no L-4 TS, etc.
Ryan