Believed to be produced by either Bulgin or Stockley.

Coated brass.

Scale reads 0 to 100.

98mm diameter, 1mm thick.

The central hole has a diameter of 19mm.

PCD is 30mm on the 3 small 3.1mm holes.

Odd hole is 31mm from the center, and has a diameter of 3.9mm

55g.