Good news! Cam Smith has found the identity of the recent mystery uniform button: It is a “Campaigners for Christ Volunteers” button. He identfied it from a reference book: Metal Uniform Embellishments of the Australian Army Post 1953 (QEII Series) Volume 1.
A couple of fellow collectors have asked me about a firm of button distributor, Grotjan & Co. The business card below is affixed to the cover of a sample folder of pearl shirt buttons owned by Jean.
F.C. Grotjan was Frederick Campbell Grotjan, son of the founding partner, Emil Grotjan, a merchant born in Hamburg who came to Melbourne in 1903. The company originally described themselves as cork merchants and indenters. They would import and distribute quite a variety of goods including foodstuffs, metal scrap and ores, horse hair and artifical limbs. In the 1930s increased tariffs on imported pearl buttons were being debated in parliament, to protect the fledgling local industry. Emil, as spokesman for pearl button importers spoke against increased tariffs. By the 1950s they were describing themselves as a wholesale hardware firm. Frederick retired from the firm in 1952.