Issued on October 16, 1923 during the final phase of the Weimar Republic’s catastrophic hyperinflation, this striking 10 Million Mark stamp belongs to the infamous Inflation Series and illustrates the extreme monetary chaos of the period. Printed by Reichsdruckerei in Berlin using plate typography, the design consists solely of numerical and typographic elements in a bold orange-red tone, framed within a decorative pattern. Each stamp measures 22 x 26 mm, with a printed frame size of 17.7 x 21.5 mm, and features comb perforation 14 x 14¼. The watermark shows the upright waffle pattern typical for this issue, and the stamp was printed on standard paper. The denomination is inscribed as "10 Millionen" in large black numerals and was used for high-value postage required during the peak of hyperinflation in October–December 1923, just before the issuance of the Rentenmark. This example is an unmounted mint sheet of 100 stamps, including full margins, print guides, and marginal control numbers, as well as the complete printer’s imprint “Reichsdruckerei Berlin.” A cracked rosette detail characteristic of the type is also present. Though unlisted in Stanley Gibbons, it is recognized in Michel as DR 318APHT and classified as a subtype of DR 127578. Condition Mint never hinged (MNH) full sheet, intact gum with bright, even color and no hinge marks, with some corner tears and edge folds visible along the margins but no impact on individual stamps. Estimate "$160 – 190".