This Dutch East Indies 50 Cent stamp, issued in 1931, forms part of the Queen Wilhelmina Type 'Harting' definitive series, catalogued as Michel NL-IN 122C, NVPH 129C and Scott NL-IN 131b. Printed by Joh. Enschedé using line engraving, it is distinguished by its deep green coloration and the finely executed portrait of Queen Wilhelmina framed by palm trees, symbolizing both authority and the colonial setting of the Dutch East Indies. Measuring 25 x 32 mm and perforated line 12½, the issue was produced without watermark and printed on high-quality engraved paper, reflecting the superior craftsmanship of Dutch stamp production in the early 20th century. The portrait of Queen Wilhelmina, adorned with a crown and surrounded by tropical motifs, embodies both monarchical power and imperial presence, and its aesthetic qualities have been widely admired by collectors. The 1931 issue is notable for its role during a turbulent period between the world wars, as the Dutch East Indies balanced colonial administration and growing calls for independence. Similar examples have been offered in European auctions, with pricing influenced by condition, centering and cancellations. Condition: Used, fine, with clear cancellation, intact perforations, and overall good preservation consistent with period postal use. Considering scarcity of higher denomination Wilhelmina issues from this series, and comparison with realized prices in Dutch and Asian philatelic markets, the estimated range reflects both historical and collector value 25-60 USD.