1961 Austrian Postage Stamp - 75 Years of Sonnblick Observatory

This is a rectangular postage stamp from the Republic of Austria (Republik Österreich) issued in 1961 to commemorate the 75th anniversary of the Sonnblick Observatory. The stamp is printed in a monochromatic slate-blue ink on off-white paper with a vertical orientation. It features a finely detailed photogravure or copperplate engraving of the Hoher Sonnblick mountain peak, showing the observatory perched on the summit surrounded by snow-covered crags. The denomination 'S 1.80' (1.80 Austrian Schillings) is located in the top-left corner. Along the top, the text reads '75 JAHRE SONNBLICK OBSERVATORIUM'. Below the image, the artist's name 'H. RANZONI D. J.' is visible in fine print. Physically, the stamp features standard comb perforations (approx. 14 x 13.5) along all four edges. Regarding its condition, the stamp is in used (cancelled) condition, as evidenced by a partial black circular postmark on the bottom right corner showing fragments of the word 'WIEN' (Vienna). The serrated edges appear mostly intact with minor softening on the upper right corner. It is mounted inside a black protective stamp mount or 'hawid' strip, which is placed on a light-colored grid paper background for storage.

I have examined the digital representation of the 1961 Republic of Austria commemorative stamp honoring the 75th Anniversary of the Sonnblick Observatory. The specimen is a standard 1.80 Schilling issue, designed by Hans Ranzoni the Younger. Upon visual inspection, the stamp exhibits a clean, partial postmark from Vienna (Wien), classifying it as 'Used' condition. The centering is balanced, and the monochromatic slate-blue photogravure remains crisp; however, there is noticeable softening of the perforations on the upper right corner, which slightly detracts from its grade. This particular issue (Scott #670 / Michel #1091) was produced in a large quantity of 3,000,000, making it a common find in European philatelic collections. Market demand for Austrian mid-century commemoratives is steady but saturated, with high supply keeping the market value at a nominal level. Comparables for used specimens consistently trade for less than one dollar in retail environments, often sold as part of 'topical' or 'mountain' themed packets. While the visual characteristics—including the specific comb perforation pattern and the 'H. RANZONI D. J.' signature line—align with an authentic 1961 issue, a definitive guarantee of authenticity requires physical inspection. My assessment through images is limited as I cannot verify the watermark (if any), paper fluorescence under UV light, or the presence of original gum (though irrelevant for used status). To confirm authenticity and rule out modern high-quality reprints, one would need to measure the paper thickness and verify the ink absorption into the fiber via a high-magnification loupe. For an item of this low market value, professional certification is generally not economically justified.