Here are four purples from Canada -- actual postage additional:

CD 145 G.N.W. TEL. CO., Royal purple, VNM but has a open bubble in the base -- $65

CD 143 CANADIAN PACIFIC RY CO, royal purple, also VNM except for open base bubble -- $65

CD 121 B.T.C. / CANADA, nice light purple, large open bubbles into threads (very cool) but creates a hard to see circular fracture around the base -- $8

CD 121 "BTC blotted out" / CANADA over blotted out MONTREAL, royal purple -- VNM (tiny open bubble on base) -- $50