I'm familiar with the duplex cancel with the straight bar obliterator but not with a wavy one as shown on these images postmarked from Alberta. Two and perhaps even the third one are from Fairview, Alberta. I have looked the cancellation up in the resources available to me (Boggs, Jarrett) and haven't found it. Can anyone tell me anything about this cancellation.

Ian Tyson would have just been learning to play the guitar at about this time.