Both are double-weight covers which required 4 cents (in this case, 2 paid, 2 due).
Skimming the 1913 Postal Law & Regulations volume: There is no "double-due" penalty for these, just the amount of the underpayment charged as postage due since some postage was paid. "Double-due" would have applied if NO postage had been paid.
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Posted 10/28/2019 7:41 pm
