@silviosi, interesting and thanks. I believe there posted a more modern coin that had "mortar set" or something I'd the like, I want to say it was a toonie but I don't remember, I would have to look through my old posts.
COOP explain very well. Me I posted the explanation of traildies cause the term was mention and not to be confuse many of us. The Canadian "Mortar set" in my opinion it is an Die Deterioration which in fact it is a variety.
As others have indicated, die flow lines like those seen on the OP's cent have nothing to do with trails (trail lines). And trails have nothing to do with Die Deterioration. Trails are die polishing grooves.
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