AI Appraisal Estimate

This is a single used postage stamp issued in 1948 for the Portuguese colony of Angola. The stamp commemorates the 'Tricantenário da Restauração de Angola' (Tricentenary of the Restoration of Angola, 1648–1948). It features an artistic blue-monotone portrait of the Portuguese explorer Diogo Cão, based on a design by artist Alberto Souza, as indicated by the 'ALBERTO SOUZA DES.' credit at the bottom left. The denomination is clearly marked as '1,75 AGS' (Angolares). Physically, the stamp is a vertical rectangle with standard perforations. It is printed on light-colored paper and has been canceled with a black ink postmark that is visible over the top-left quadrant of the portrait. The condition appears fair to good for a used specimen; while the perforations seem mostly intact, there is some minor toning or yellowing consistent with age (patina) visible on the paper. There are no immediate signs of significant tearing or creases, though the cancellation mark obscures some of the fine engraving detail in the upper portion of the face. The craftsmanship represents mid-20th-century colonial philatelic design, characterized by detailed line engraving and a formal historical layout.

I have examined the digital image of the 1948 Angola Diogo Cão 1.75 Angolar stamp. This issue was part of a common commemorative set marking the 300th anniversary of the restoration of Portuguese rule. Visually, the stamp appears to be a genuine contemporary specimen. The engraving details match known Alberto Souza designs, and the '1,75 AGS' denomination corresponds with the standard mid-value issuance of the series. Condition-wise, this is a 'Fine' used example. The perforations are reasonably intact, though slight rounding is visible. The cancellation is fairly light but still obscures the portrait's forehead, which collectors generally view as less desirable than a 'Socked on the Nose' (SON) circular date stamp or a very faint corner cancel. The visible toning or 'patina' is typical for tropical colonial paper, though it does slightly detract from the aesthetic brightness compared to a pristine mint example. From a market perspective, this is a high-volume, readily available philatelic item. The 1948 Restoration series was printed in large quantities to satisfy both local colonial needs and the global collector market. Current market comparables show that while full mint sets have modest value, individual used stamps of this specific denomination frequently sell for under two dollars. Limitations: My assessment is based on a visual image only. A physical inspection is required to check for hidden flaws such as paper thinning, 'hinge remnants,' or chemical washing. Authenticators would use a watermark detector to verify the paper type and a UV light to check for repairs. Provenance documentation is not typically required for items of this value bracket, but physical certification would be necessary only if the stamp were part of a rare specialized perforation variety.