rod222 - here's some possible varieties for the stamps.
You have been busy with the Magnifier
I'll save those images under the Scott number, when I get the chance to
do the same.
TIP: As the stamp I showed were all Gum Arabic or otherwise, they will soak off without problems.
Self Adhesive stamps, cannot be removed, whatever release agent is employed, leaves a gum remnant on the stamp below it, so futile to separate overlapping self adhesives. (In my experience)