Green’s Dictionary of Slang

(Aus.) ten, in a variety of contexts, e.g. ten ounces of tobacco.

1939		K. Tennant Foveaux 310: If someone did a night with you and threw you a sein, you’d snatch it with both hands.
1944		T. Hartley gloss. in Simes DAUS (1993) 178/1: sane sayne Ten shilling note.
1953		Baker Aus. Speaks 134: sane — Ten, ten months, ten ounces of tobacco; but note that ten years or £10 is always a brick.