. Mortar Set It's the result of Deteriorated Die | Die Deterioration Doubling, when the die met or exceeded its useful life stage. More information on mortar set »
Thank you muchly for the Website link. I had not seen the site before. Obviously I need to brush up on my Canadian. Perhaps the word "Mortar" comes from the root word Mort or death as in death of a die. The terms "die deterioration doubling" or "deteriorated die" make more sense to me. The Canada coin website also lists a "retarded coin" of which I was not familiar.
