I am not an experienced worldwide collector Nvdiva. I do have a few thousand worldwide stamps and I recognize some of the ones you have scanned. They all appear to be era specific and not especially valuable, but you really have to spend some time cataloging and pricing them by issue, variety, paper type, perforation and watermark. Off the top of my head I would expect most of them to be minimum catalog value stamps, but unless you spend some time with them you will never know. Typically minimum value stamps go for a nickel apiece at stamp shows.
