Historical information

Jantzen is a brand of swimwear that was established in 1916 and first appeared in the city of Portland, Oregon, United States. The brand name later replaced the name of the parent company that manufactured the branded products. The brand featured a logo image of a young woman, dressed in a red one-piece swimsuit and bathing hat, assuming a diving posture with outstretched arms and an arched back. Known as the Jantzen "Diving Girl", the image in various forms became famous throughout the world during the early twentieth century. (Wikipedia).
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Physical description

Black men's woollen swimming trunks made by Jantzen. Inside label - "Jantzen" (red print), "Made in Australia" (faint green print). The trunks have a bone coloured cotton belt threaded through tabs at the waist. A silver coloured buckle has "Rustless" imprinted. Late 1940s.
On the front at lower right is the Jantzen symbol of a costumed female swimmer in a diving position with arms outstretched.