<a class="ck-btn" target="_blank" rel="noopener noreferrer" href="https://competent-prize-bbe30fc6a2.media.strapiapp.com/S25021_General_Insides_Online_9d9d853453.pdf" download="download">View Auction Catalogue</a>Sale No. S25021&nbsp;Please note our Buyer’s Premium has changed to 23% + VAT effective from the 1st of December 2025

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A H Baldwin & Sons Ltd has a history that dates back to 1872, and is one of the largest and longest established numismatic dealers and auction houses in the world. As a distinguished name in the numismatic trade, they have seamlessly transitioned into the world of bullion, bringing unparalleled expertise and commitment to quality to a broader audience.

Established in 1872, Baldwin's has been a cornerstone of the numismatic trade, earning a reputation for integrity, authenticity, and a passion for the rare and precious. For over a century and a half, we have been at the forefront of preserving and promoting the art and history encapsulated within rare coins and precious metals.

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Official. 1915 6d ultramarine, wmk 5, die II, type O2 ‘OS’ puncture, upper marginal, error Double perforations on three sides, mint o.g., very scarce. Ceremuga cert (2025). SG O33 var (BW 18ba var, cat A$1250)

Australia SG O33 var 1915 official 6d ultramarine double perforation mint

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