Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1378:
PRE-ADHESIVE PERIOD: 1810, the second Wenden straight line marking in capital Latin letters measuring 4x31mm, applied on entire letter from St. Petersburg to Riga, wax seal on reverse, mounted on original page from the Collection, VF and scarce, Est. $150-$200
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