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Do all stamp designers put their names/initials on all stamps...???
Not necessarily, but some do. But it's fun to get out your loupe on a rainy Sunday afternoon like today, and look for them (is that pathetic? Help me out here!)
My own avatar has a small H for Emanuel Otto Hahn, next to his left fin (right side of stamp) All of the wildlife stamps that Hahn did from the 50s were signed. The 1957 loon has LH for Laurence Hyde. Many had the year small like shown on the textile stamp.
You'll see designer initial on Canadian coins all the time. I don't know about other countries