



Nothing really special here. Machine cancel from Florida. However, the cover does have an imperf stamp pair on it. Or more correctly, a pair that lacks die-cuts, because all US stamps are self-adhesive. This was a 2021 stamp issue that contains a hidden message in the design that isn't all that hard to figure out. USPS sells sheets or plates of stamps without die-cuts at face value but only in limited quantities. They tend to sell out fast and usually end up on the resale market.
On this cover from Novi Sad are a pair of 2024 Europa stamps. The theme that year was underwater flora and fauna. On the left is a European pond turtle and on the right is a white water lily. And something else I just noticed: Latin alphabet on the left and Cyrillic on the right.
A nice cover from the French Antarctic research base Dumont d'Urville. Stamped and signed by expedition participant and chemist-glaciologist Clémence Ferrand. The red handstamp in the middle appears to be that of the MV Astrolabe with it's slogan "Toujours plus sud": always further south. They were able to supply the base on 23 November 2025 which matches the datestamp in the postmarks.
From the Australian town of Seymour, north of Melbourne. The two stamps on the left are Australian Antarctic Territory stamps from a 2025 set of four depicting Antarctic krill. AAT stamps can be used on Australian mail just as Australian stamps can be used on AAT mail. The heart shaped stamp with the penguins is a personalized stamp.