I dunno if this helps or not
http://thebrodiehelmet.weebly.com/military---canada.html
In W.W.I the Canadian Expeditionary Force was issued Brodie and Helmet Steel Mk.Is from British stocks. These frequently had Canadian unit badges or, towards the end of the war, the geometrical battle flashes as worn on Service Dress sleeves.
After the War stencilled unit badges seem to have prevailed. 3 Division helmets were painted grey. From 1940 some 26,000 Mk.I or US M1917 helmets were converted to Mk.I* helmets by the addition of new rims,lugs, chin-straps and linings.
Procurement of Canadian versions of the British Mk.II helmet was initiated in January 1940, with the first contracts issued in late May. Some 1.1 million helmets were produced between 1940 and 1943 by Canadian Lamp Company of Windsor, General Steelwares and Aluminum Goods of Canada (both of Toronto). The total included 155,000 mild steel helmets made by GSW in 1942 for the Department of Pensions and Health for use by the Air-Raids Precautions Service (ARP). These have their lugs,welded,not riveted to the rim.
Mild steel ARP helmets have no date or batch number and but are marked G.S.W. DP&H
The Canadian Mk.II was made of 0.825 mm non-magnetic Hadfield manganese steel, giving them a v50 ballistic resistance of 900 ft/sec (270 m/s) They retained, throughout their 1940-43 production run, the features of the British pattern, as it was in late 1939, with the square Mk.II lugs, the web and springs Mk.II chin-strap (with a finer weave than on British chin-straps) and the wide brass Mk.I lining securing bolt with a domed nut.
There were minor variations over time to the chin-strap and the lining. The earliest chin-straps differed from the standard British (and later Canadian) pattern by having a blackened brass buckle with two closed centre struts, and only one piece of webbing joining the two sprung pieces.
After 1940, Canadian straps, like the British ones, had two strips of webbing, one of which has a free sewn-over end, the other of which sewn to the centre strut of a buckle which, like the British pattern, has 3 struts - the two side ones being open.
General Steel Wares Aluminium Goods used respectively the logos G.S.W. and A.G./C. and a letter to indicate the batch. As the official Canadian designation for the helmet bodies was Body Mk.I to Helmet, Steel Mk.II. GSW stamped Mk.I on its helmets.