* In 1917 the model was altered by shortening the stick to 216mm and fixing 4 cloth tails.
The filling was reduced to 85gram (Ammonal). It was called Mk2.
The Mk3 was even more simplified and had a fragmented ring in 2 parts.
Eventually this type was renamed "No.18".
The pictures below are property of Siegfreid, and show the No.1 Mk3, manufactered between 1908 and 1916.