We sold the original limestone used to print the lithography for both the C56 hockey and C60 lacrosse sets in 2011. While it doesn't in any way confirm attribution of the C46 baseball set, the presence of Toronto advertisers does suggest Canadian production for both the C56 and C60 issues, as many believed previously that the cards were printed in England, akin to the 1910-11 Sweet Caporal postcard set.
Hopefully this info might help.
https://www.classicauctions.net/mobi...ntoryid=112606