I have some brazilian second world war stamps!

These were collected when I was a child in 80’s and 90’s. Lots of Mongolian, Polish and some from other countries.
I do not collect stamps but have two albums almost full. I’m just curious to hear what do I have and how common are these? Few pictures attached. That’s maybe 10-15% of it all

Anyone have an idea what these stamps are worth?

This is the the repost of the first because of a little miscommunication,but I know it's Hindenburg stamps I have a whole lot of them just I've never seen the cancellation before

Sent from Austria, received an 8-puffin overprint upon arrival at Lundy.

Someone showed me this stamp, claimed it's likely released by local/private postal service in NY or Baltimore at ~1841 - 1845, and he could not find it from any catalogue. Can anyone recognize it?

Thank you.

Hi! I just inherited my father’s stamp collection and it’s fairly large. I have no idea where to start or what to do with it. Any stamp collecting 101 tips?

any suggestions as to where to sell a large collection of unused, unhinged U.S. stamps? Colombian expedition, Scott #505 error, tons of sheets from the 1930s/40s …. i was being offered 10% of face value - and $200 for all of the Colombian expedition (up to and including $3). all unused,excellent condition, unhinged

Hi friends! I am new to collecting after inheriting a collection from my great grandfather and really enjoying diving into the world of stamps! I have tried to identify these both using apps to no avail. One said it’s from Thailand, which it clearly isn’t but I’m really struggling to identify. Any thoughts?

I do not collect these categories.
I am seeking children, cartoons, book stamps, author stamps.

Please reach out with your offers.