It is outside of the Armoury of the Reserve Battalion of the “Le 12eRBC(M) de Trois-Rivières” located in Trois Rivières, Quebec.
Here is a link to their web site.
http://www.12rbc.ca/troisriviere.htm
Here is a photo of an early Sherman V (M4A4) with the correct 75mm gun. It looks like someone just welded a 17pdr barrel onto the gun mantle of the Three Rivers Sherman along with a support bracket to carry the weight.
Is CT150503 the original WD number?