WW1 CEF, 10th Regt, Canadian Mounted Rifles Collar Badge.

Canadian Mounted Rifles Collar Badge (Sweetheart Brooch Conversion)
A First World War collar badge of the 10th Regiment, Canadian Mounted Rifles (CMR), Canadian Expeditionary Force. 
moose head over a scroll reading “CANADIAN MOUNTED RIFLES”, set on a maple leaf bearing “FOR KING & EMPIRE / OVERSEAS” with the King’s Crown above the Roman numeral X denoting the 10th Regiment. Bronze finish, single-piece die-struck construction.
Regimental History
The 10th Regiment, Canadian Mounted Rifles was authorised in November 1914 and mobilised at Regina, Saskatchewan, recruiting from Regina, Moosomin, Indian Head, and Grenfell. The unit sailed from Halifax aboard RMS Olympic on 1 May 1916, arriving in England on 6 May 1916 with a strength of 23 officers and 395 other ranks.
Like every CMR unit, the 10th never served in its intended mounted role. The harsh realities of trench warfare meant that mounted infantry was redundant on the Western Front. On arrival in England the regiment was absorbed straight into the Canadian Cavalry Depot, with its personnel feeding the four CMR battalions already in France (1st, 2nd, 4th and 5th CMR) which had been converted to infantry as part of the 8th Canadian Infantry Brigade, 3rd Canadian Division.
The 10th CMR was disbanded by Privy Council Order 1895 on 17 July 1917. Its perpetuation passed to The Saskatchewan Mounted Rifles, which in 1936 amalgamated with the 16th Canadian Light Horse to form the 16th/22nd Saskatchewan Horse.
Although the regiment itself never saw combat as a formed unit, its men fought through every major Canadian engagement from mid-1916 onward, scattered among the CMR battalions that took part in the Somme, Vimy Ridge, Hill 70, Passchendaele, and the Hundred Days.