Heat pressed numbers? Those look like twill to me - the bottom left corner of the "1" on the back is slightly curled in a way that suggests older twill, and the "1" on the sleeve has wrinkling in it that you don't get in heat-press vinyl. I imagine it's a CCM pre-customed jersey, so all of the numbers and letters are twill cut, pre-stitched together, and then heat-pressed (aka: used an insane amount of glue) onto the jersey. So still twill numbers, and still stitching, but not stitched onto the jersey. If that makes sense.
The jersey itself is legit, in case you were worried about that. Not many people were counterfeiting the old CCM stock, and when they did it was OBVIOUS. Also - This era of jersey was the "baggiest" in terms of fit, in case that matters to you.
Otherwise, all the font looks good. Seems like a good deal at $50. Is this off of Kijiji in your area or something?