how do i know that my old stamps are worth money... the stamps r from many countries.?

Answer 1

You can :

1) Use the Stanley Gibbons online catalog by clicking this link :
https://www.stanleygibbons.com/priceguide/
2) You can ask a philatelist or stamp collector
3) You can go to your local library and look for stamp catalogs or books

Answer 2

it dependsd how previous they're and how many the place offered on the time the two making its value bigger or decrease and doubtless somtimes some can b worth much less yet u ought to examine with a expert on stamp amassing with that