PO boxes 19041 + 19108
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April 5, 1927
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March 11, 1930
Between 1927 and 1930 two PO boxes were used for buying and selling stamps anonymously: PO box 19041 (1927–1929) and PO box 19108 (1929–1930).
Covers with these PO boxes as return adresses on them are shown below.
The originator of these covers has yet to be determined.
Although their franking makes them look like typical Eugen Sekula covers the anonymous ads placed during these years (figures on the left and right) make it unlikely that a registered stamp dealer like Eugen Sekula had anything to do with them.
The first cover was sent completely anonymously in 1928. However, it shown here as a possible forerunner because of its Sekula-style franking and the fact that it was also posted registered at Luzern 6 Zürichstrasse.
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September 3, 1927
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September 5, 1927
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September 7, 1927
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January 12, 1928
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January 13, 1928
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January 14, 1928
Cover — January 21, 1928


Cover — August 24, 1928


Cover — January 10, 1929


Cover — February 28, 1929


Cover — May 20, 1929


Cover — July 13, 1929


Cover — August 19, 1929


Cover — December 7, 1929


Cover — September 26, 1933

