The barrels weighed 1.083kgs or 2.38lbs at time of proof.

It passed Superior Proof 20,000 psi for gauges under 16ga.

As of 1924, the diameter of the choked portion is no longer indicated by the proof house.

Siemens Martin barrels replaced Cockerill in about 1900 until about 1911. These dates are very rough. It was a period known as "the German School".

Pete