What is it?

[WRA]

 

[Doug Money]

Looks like Magneto magnet

 

[Steve Jelf]

You can test your magnets with a spindle, which weighs a little over two pounds. A Model T cast iron piston is also a good test weight.

 

[Jack Innes]

here are 16 magnets like yours mounted on the T flywheel to energise the magneto.

 

[WRA]

Excellent, thanks!!

 

[tmodelman]

Use that Ford horseshoe magnet and a screwdriver shank to remove metal particles from block bolt holes....