The cover below was posted at Noumea, New Caledonia, on 4 June 1942. Aside from the civil censor markings applied in Noumea and Sydney, NSW, there is also a cachet in blue ink with the words "Service Sanitaire". Google Translate provides a translation: "sanitary service".
Is this a cachet applied by the post office in New Caledonia indicating some significance to the postal article, or is it a Government agency device, or maybe something else entirely?
