Those were installed by Ford at the factory in 1911 - 1913. Good plugs. Mosler also made great timers and carburetors for Model T that are interesting accessories.
Royce, nice pics.
Mosler also makes one of my all time favourite "tough guy" plugs the Vesuvius.
CAUTION ! Because of the heat these plugs generate they should NEVER be used with alloy P or Z heads unless you fancy seeing your pistons shoot glowing red molten metal skywards.
The tin holding that spark plug is spectacular. I could see collecting these things if they all had containers like that!
Rick, you're in luck :