JMG (Jack Maskiell Guitars) was founded by Jack Maskiell who began making instruments in Adelaide before World War II. In the war he was posted to the Pacific and ended up a prisoner of war with Les O’Connell in Changi Prison, where they made a ukulele to pass the time. Despite losing a leg in Changi Maskiell went into partnership with O'Connell in Perth on their return Australia. They established a workshop in the yard of Perth builder RJ Davies and began making ukuleles. JMG Instruments went on to employ other ex-servicemen and former Subiaco footballer John Hetherington who worked in a wheelchair following a footballing accident.

In 1948 Les O'Connell got a patent for his ukulele design, whereby the sides of the instrument were glued into a groove routed into the top and back - patent 2869/46. Their ukes sold in Australia and South-East Asia, and by 1950 JMG had sold 3000 ukuleles and 700 guitars. JMG ceased trading in 1959.

Luthier Andries De Jager - who was based in Mt Lawley, Perth, Western Australia, worked there in the 1950s. An article from Australian Women's Weekly 1961  indicates that Mr De Jager emigrated to Australia in 1953 from the Hague in the Netherlands. Following the closure of JMG in 1959 he sold classical guitars under his own name (as one of the few classical guitar makers in Western Australia at the time).

Source: The backward ukulele player site  and the uke database

Source: Perth Daily News, Tuesday 16th May 1950, page 9.