An interesting item with what I believe to be an unreported marking.
The cover is postmarked Liverpool GB January 13 1942 headed to Berkely California. The envelope is sealed with a GB PC 90 label with censor number 1864. This censor has been reported in Konrad Morenweiser's database associated with Liverpool.
On the reverse is a District 29 Licensed rubber stamp dated 2/14/42.
Dann Mayo's monograph on Traveller's Censorship reproduces as Appendix F a notice from the Bureau of Customs identifying this type of "Licensed" handstamp as "being used by customs officers in licensing communications leaving the United States".
Does anyone have a suggestion on how/why this obviously incoming cover from GB would be stamped with the marking reserved for outgoing mail? Thanks in advance for any ideas you might share.
Dave