Trumpy:
"All of us Lines Co inspectors over here (in my area anyway), use crimp tools unique to each Inspector, to crimp lead/wire seals."
We used to have lead seals here (USA/NJ/PSE&G), you brought back a memory!
Guess the lead was an enviro issue....now plastic with wire (steel); push-in wire to plastic 'tag' with 'serial numbers'