Many stampless covers were sent by Condominium institutions. For a nearly complete list of their cachets you might want to buy Bill Holland's New Hebrides Official Cachets/Nouvelles Hebrides Cachets Officiels here at the Pacific Islands Study Circle.
The "POSTE PAYEE / 10 CENTIMES D'OR" postmark
This postmark is very scarce - only these three covers are known - and there doesn't exist any research so far.
26 December 1950
Only one other seen before: "POSTE PAYEE 10 CENTIMES OR" on a cover to Patrick O'Reilly, author of "HÉBRIDAIS" and other Pacific books. (Klinger coll.)
8 January 1951
And here is a third one of these poste payée covers: "POSTE PAYEE 10 CENTIMES OR" on a cover to Mr. Ménager, Santo and cancelled Santo.
The blow-up clearly shows the date 8 JAN 51. ("SeSi" coll.)
8 January 1951 (or 54)
17 January 1951
Local cover (only front) to Mr Menager Santo. POSTE PAYEE 10 CENTIMES OR tied by type PM16 SANTO 17 JAN 51. ("SeSi" coll.)
10 February 1951
Here is another one: "POSTE PAYEE 10 CENTIMES OR" on a cover to Mr. Menager, Santo and cancelled Santo.
Image thanks to Gaertner auctions, Germany
10 February 1951
It is quite interesting that one of these is cancelled Port-Vila, the other two Santo. Was this cachet present at both post offices?
Letter from the Joint Court in Port-Vila to Nouméa. O.C.S. handstamp and
Official Cachet Holland type oc3 applied, cancelled with PCH type 13. (Merot coll.)
Registered letter from the New Hebridean PO to England. Registration label
PCH type R12 recorded there to August 1954 - so it has been used more than
two years longer. Top line in machine writing reads "PHILATELIC MAIL - - - -
POSTAGE ENCLOSED.". (Klinger coll.)
Postmaster cover to the U.S.A. cancelled with GK Type PM18A. (Lebourcq coll.)
Postmaster cover to the U.S.A. cancelled with GK Type PM19A. (Lebourcq coll.)
20 December 1951
dd December 1956
15 April 1957
3 August 1957
Postmaster A.C. Hirsch letter to the U.S. Stampless and cancelled with PCH Type 17.
The enclosed order form with advice on the present stamps still with the cover.
Letter from the Service des Contributions Customs Vila to the Crown Agent for
Oversea Governments and Administrations. Dated 25.4.64, PCH type 22.
The cachet on the letter says: "Condominium Treasury,
Bureau des Finances du Condominium." Holland type c7. (Klinger coll.)
Letter from the Public Works Department to The Crown Agents For Overseas
Government & Administration, London. Date: 21.10.64, PCH type 21, cachet
Holland type oc4. (Klinger coll.)
Letter from the Service de l'Agriculture Vila to the Crown Agent for
Oversea Governments and Administrations. Dated 10.11.64, PCH type 22.
The cachet on the letter says: "Condominium des Nouvelles-Hébrides, Service de
l'Agriculture." Holland type c47. (Klinger coll.)
23 November 1959
25 April 1964
21 October 1964
10 November 1964
Cover from the French residency to Noumea (with cachet and stampless) and redirected with a New Caledonian stamp on 13 July to France. (Michel Blanc coll.)
Postmaster letter to the England. Cancelled with GK Type PM30A. (Lebourcq coll.)
Postmaster registered letter to France. Cancelled with GK Type PM30A. Registration cachet GK type NR20C. (ex Millet coll.)
Postmaster letter to the U.S.A. Cancelled with GK Type PP2A. (Lebourcq coll.)
11 July 1966
28 October 1966
20 May 1968
15 July 1970