As LL said. This is an advert from The Melbourne Argus 1938: 

"TURN IT OVER"

In 95 out of every 100 leading Hotels Guest Houses, Cafes, &c., if you turn over a plate you will find it stamped "Grindley Duraline Hotel Ware, Supplied by Loftus Moran Pty. Ltd."-conclusive proof that this ware is the most suitable for Hotel, Guest House, and Cafe use. Sole agents,

LOFTUS MORAN PTY. LTD..

6 Queen's Bridge Street,

South Melbourne,

Hotel, Guest House, and Cafe Specialists.

Tel. M3371 (2 Lines).