Yes, 1400 is the accepted cut-off date for block-printing on paper. There is obviously some looseness to that date (they were block-printing on fabric by 1350, for example) but it's the date everyone uses for common reference. We've got lots of surviving card examples from the 15th Century and they were block-printed and stenciled to a large degree. They still made some by hand, the Ambraser decks spring to mind, as do the Topkapi cards, but mass production was needed to meet the demands for playing cards which were so popular by the end of the 14th Century that civic authorities were banning their use because they were causing problems. The French, for instance, banned playing cards on work days. Apparently they were popular enough that people were skipping work to play them.
I've added green to the final card, but this is pretty much the final design for the ten. The original cards would have had a rectangular border but that limits the space I can use on modern cards (stupid rounded corners) so I've left it out. I'll add the border back in for block-printed cards.