A big one from Pakistan

This envelope is quite large actually, and has stamps on the front and back. Postmarked at the philatelic bureau in Rawalpindi. Twin to neighboring Islamabad. The 2025 souvenir sheet on the right commemorates international women's day. At the top is a 2025 stamp commemorating the five year economic plans launched in 2024 known as URAAN. And on the left is 2026 stamp that commemorates the 25th anniversary of the PARCO Mid-Country Oil Refinery.

More on the back. At the top is a pair of 2025 stamps commemorating the 75 anniversary of diplomatic relations between Pakistan and Sri Lanka. Bottom left is a 2014 stamp commemorating the 2013 100th anniversary of Pakistan's paramilitary police force: the Frontier Constabulary. And bottom right is a 2 rupee Jinnah definitive.

Algerian Flora and Fauna

Here's a recent souvenir sheet from Algérie Poste featuring local flora and fauna. On the top are stamps depicting green mint and wild thyme. And on the bottom are the African golden wolf and the cat-like  and elusive genet.

Norway's Thor Heyerdahl

Here is set of stamps issued in 2014 to commemorate the 100th birth anniversary of Norwegian adventurer Thor Heyerdahl. The raft in the stamp on the left was used in his 1947 Kon-Tiki expedition to sail (drift) from Peru to Easter Island. And the one of the right is the Ra II which he used to sail from Africa to Barbados in 1970. His theories on migration are controversial and perhaps somewhat racist. But he did prove it would have been possible for ancient peoples to cross vast oceans using the limited tools and technology they had available at the time. 

More Than Meets The Eye!

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.