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Re: US / San Juan: Numbers on back of censored covers

PostPosted: Fri Dec 25, 2020 10:19 am
by johnw
San Juan tracking numbers. I have just released a book which explains these numbers (and much more about San Juan censorship). "Pan American Airwyas wartine Transatlantic air mail. Censorship and the LATI Substitute". Published by the Royal Philatelic Society. Should answer many questions and perhaps raise a few more!
John Wilson