I have a stamp that has an f-86 sabre jet on it. It says 25$ liberia also. Can someone tell me what it is worth to collectors?

Can you post a picture of it?

Sadly, unless it's a very rare stamp, it's not worth much. I have a few rare stamps in my collection, and even though they're rare, they're only worth around $15 each. You'd have to find an extremely rare stamp, and the right collector, to make any money off it.

But, a picture of your stamp would be helpful in determining its worth.