The answer to the above question is that both are rotary press printed stamps. Canada # 165 is a web-fed rotary press wet intaglio printed stamp. Canada # 217 is a sheet-fed rotary press dry intaglio printed stamp. The point being made by this is that just because the gum on the back of a stamp looks smooth does not always mean that it is a flat plate printed stamp. Embossing on the back gum usually means that it is dry printed.
It is too bad that some catalogues don't also use perforations to distinguish such printings as well instead of just relying on the appearance of (wet or dry) gum since the usual perforations for BABN rotary press printed stamps gauge 11 1/4 x 11 and the usual perforations for BABN flat plate printed stamps gauge 11 x 11. Canada 195d gauges 11 1/4 x 11 so that it is not a flat plate stamp.
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