An Editor's note under a facsimile of vol 1, no. 7 reproduced in The Anzac Book (1916, 2010), states that the periodical was 'chiefly composed and edited by Sergt. Noonan, 6th Batt[alio]n, A.I.F. (previously editor of Sniper's Shots). The Dinkum Oil (which is Melbourne for 'True News') appeared during June and July 1915, and circulated in the 1st Australian Division.'
Ashley Ekins in 'A 'Precious Souvenir': The Making of The Anzac Book', published in The Anzac Book (2010), describes the periodical; 'The best known to soldiers at Anzac was the Dinkum Oil (solders' slang for 'genuine information'), which reported improbable furphies as humorous 'War News', together with comic notices and advertisements.' (xiv-xv)
The issue reproduced in The Anzac Book is handwritten.