It is Proud type D172 (state 2) datestamp, recorded used from Dec 30,1938 to Nov 26,1941.
It is Proud type D14 (state 2) datestamp, recorded used in first phase from May 15,1938 to Dec 8,1941.
This circular K14
mark is Proud type PB24 delivery beat mark/postman's chop of Gaulung PO.
A sharper scan of this mark (KE14?) may help to identify the Gaulung PO beat mark.
It is Proud type D139 datestamp, recorded used in first phase from Aug 4,1928 to Sep 18,1941.
I assume the marking below was applied in Macau, and partially says "INCONNU NOT KNOWN"? Is that correct?
This Proud type I32 INCONNU/NOT KNOWN
rectangular cachet (recorded used from Sep 17,1929 to Oct 24,1941) was actually applied by Heunggong GPO.
It is Proud type D5 Heunggong Returned Letter Office datestamp, recorded used from Feb 2,1933 to Nov 26,1941.
This oblong RETOUR
cachet is Proud type I48 mark, recorded used from Jul 26,1926 to Mar 11,1941. It was applied by Heunggong GPO after the cover was directed from the RLO to send it back to the sender in Tianjin.Resealing Label
: The OPENED BY CENSOR
(inscription length: 7.6cm) resealing label is Morenweiser/CCSG type 3A which is recorded used from May 5 to Oct 22,1940.
It was applied at the Heunggong Censor Station after it was redirected from Oumun, before handing over the cover to Heunggong GPO.Postal Rate
: The surface rate from Tianjin to Oumun was calculated on the domestic mail rate which was 5c per 20gm from May 20,1932 to Sep 19,1940.
Ref. 1. The Postal History of Hong Kong 1841–1997
Edward Wilfrid Baxby Proud .
Proud-Bailey Company Limited, Heathfield, England 2004 2nd Ed.
Chapter IV: Hong Kong–Post Offices and Postmarks
Hong Kong General Post Office
Datestamp; pp.314, 318
Instructional Marks; pp.424-5
Hong Kong DLO; p.460
Postman's Beat; p.675
2. British Empire Civil Censorship Devices World War II (Section 4: British Asia)
Konrad Morenweiser .
The Civil Censorship Study Group, Caversham, England 2011 6th Ed.
Listing of Resealing Labels; p.114