I love a simple cardigan with an interesting stitch - and as a plus, this cardigan is knitted in 5-ply/sport yarn for a quicker knit!
This lovely knitting pattern is from Patons and Balwins Style, Volume 10.
Have you come across Trove, the digitised collection from the National Library of Australia? It's very easy to get lost in there, reading old newspapers and finding old knitting patterns - but an overlooked resource are the advertisements.
After a bit of a search, I found a reference to an advertisement for Style Volume 10 in 'The Mercury', dated 30 May 1944. Definitely another great resource for dating your own collection!
Fiesta is knitted with a diamond pattern formed from knit and purl stitches, with a finished size of 36 inches. Pattern requires 5 ply/sport yarn, plus 3.25mm and 4mm needles.