Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 2
Lot 850:
1919, double black monogram surcharge 100r (one monogram, but two 100r at top and at bottom of the stamp) on perforated 7r green and pink, full OG, NH, VF and scarce, this error is not listed either in Scott or Artar, Est. $100-$150 , Sc. #161 var
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