"My father described the plane as being on a 'hush hush' mission. Beyond that I haven't been able to learn anything further," he said.
Like the Catalina, the Martin Mariner was used widely throughout the Pacific as a submarine spotter and rescue aircraft for downed airmen and lost seamen, as well as intelligence gathering. With its distinctive gull wing configuration and twin tail, it was designed to complement the Catalina and was used widely in the Pacific, although not so much in New Zealand.
"That makes its presence in Mangonui Harbour all the more interesting, particularly as there was a high level of secrecy around military movements at the time," Jack said.
"We'd love to hear from anybody who might recall the visit of the plane to Mangonui, when it came here, how often they recall Air Force planes flying into Mangonui, and anything else about those years they might remember."
Recording historyThe inventory project, which included oral history interviews and archival research by Jack and Dr Bill Guthrie, of Parapara, had enabled a lot of information about Northland during World War II to be recorded and catalogued.
"It's a continuous work in progress, however, and we are always keen to talk to people who have information on those war years, and particularly those who were alive at the time," he added.
And while locals were racking their memories of the mysterious Martin Mariner, they may also like to turn their attention to the visit of a Fairmile ship seen hugging the coast as it steamed into Mangonui.
The ship's arrival was also captured on film by Ivan Hall, at much the same time.
"The Fairmile ships were used primarily as motor torpedo boats and for mine clearance," Jack said.
"Most famously HMNZS Kahu was used as a passenger ferry after the war."
The vessel in the photograph did not appear to have any naval markings on its hull, but Jack was very keen to hear from anyone who might have any further information on either or both of the wartime visitors.
"It all adds to our knowledge base, and helps us build a broad, comprehensive picture of what was going on militarily in Northland during World War II," he said.
Anyone who had any information to offer was invited to contact Heritage New Zealand's Northland manager, Bill Edwards, on (09) 407-0471.