Australian 'Roo on Map' or King George V Head Stamp (Used)

This item is a used postage stamp from Australia, featuring a portrait of what appears to be King George V or an allegorical figure, possibly related to an early 'Roo on Map' design, though the image quality makes precise identification challenging. The primary color of the stamp is a deep green. It is rectangular in shape with perforated edges, typical of early to mid-20th-century philately. The word "AUSTRALIA" is clearly visible across the top margin of the stamp in capital letters. A denomination of '1d' (one penny) is discernible in the bottom right corner. The central vignette features a bust of a figure, likely a monarch, facing somewhat right. The printing appears to be gravure or lithography, common for stamp production of that era. A significant condition issue is the heavy black cancellation mark, which obscures a substantial portion of the central image and some of the lettering, traversing diagonally across the stamp. This indicates it has been through the postal system. The perforations appear to be intact, though the overall clarity of the image is compromised by the low resolution and the cancellation. The stamp paper itself seems to be standard, unwatermarked paper, common for colonial issues. The style suggests an early 20th-century issuance, likely from the 1910s to 1930s, given the '1d' denomination and the regal portraiture common for British Commonwealth stamps. The visibility of the cancellation mark makes it a common used stamp, often sought after by collectors for contextualizing historical mail.