Victoria Police Force
This is only my 6th button produced by Stokes and Martin, and this one has a new (for me) back mark; Stokes & Martin Markers Melbourne. My others just say Stokes & Martin Melb, or (on a small one) Stokes & Martin.
Auckland Electric Tramway: 1902-1956.
I love the design; a wheel, a giant magnet and bolts of electricity.