Hi Leadfoot - hope you're well.
I'm extremely jealous of your collection!
I've been carrying a Powerful Pete on a chain around my neck for years now, and have had a fascination with them ever since my mum gave me my grandpa's one that he used to carry around on a keyring. I've also amassed a small connection of similar pocket tools, including several of the "Terry's" ones you show above.
I've noticed that the Powerful Pete's I own noticeably vary in thickness, with the (presumably) later ones depicting a strongman being thinner than the ones that have the name plus "H C Cook Co" script on one side and the 4 leaf clover on the reverse. I suppose this would've been a measure to cut costs.
Have you noticed any differences in thickness of your collection and, if so, could you tell me the thickest design type you've come across?
Thanks in advance.
Kind regards
Tove.