As doug222 mentioned, you should sort these out into groups... and please rescue the curled ones as you never know what is valuable in philatelic or financial terms. Flatten them between pages of books or similar.
There are several that catch my eye...
this one has an Aberdeen postmark and I'd love to see a closer scan.

This one has a Maltese Cross cancel so is worth another closer look too.

All the numbered postmarks are of interest... many collectors like to have their local postmarks for instance and some of the Post Offices making the cancels no longer exist