&####127464;&####127462; Canadian Respirator, Anti-Gas, Light Mk. 1 dated April of 1945 by Viceroy Manufacturing Company size Normal. The Canadian series of Light Anti-Gas Respirators is a bit of a strange one, given how outdated they are as the Mk. II are based on the first generation LAG masks which utilizes the L1 valve assembly and Civilian Duty Respirator style Rubber Facepiece assembly into about 1945. 1 LAG was produced by the Viceroy Manufacturing Company as a clone of the British Mk. 1 LAG and uses the L3/C Facepiece, based on the British L1 Facepiece which were converted Civilian Duty Respirator Molds. The Filter to the Mk. 1 is either the Light Mk. II and is dated on this example April 7th 1945. The head harness for this mask is very damaged.