Huck
It was possible to get the Master PW - deck online. It has a 5x14-structure - beside at least 2 other decks and a note in Johannes of Rheinfelden it gives evidence, that decks with a 5th suit were relatively common in the early time of playing cards, - and it gives evidence, that the 5x14-playing-card-deck existed (a first example are the 70 cards of Bembo - as part of the Pierpont Morgan-Bergamo-deck, but this was disputable cause of the 6 additional cards by the second painter).
Master PW (EVIDENCE of 5x14-deck and a 5th suit)
http://trionfi.com/0/j/d/masterPW/
5x14-theory
http://trionfi.com/0/f/
Liechtenstein'sches Spiel (evidence of 5 suits)
http://trionfi.com/0/j/d/liechtenstein/
Master of the Playing Cards (evidence of 5th suit)
http://trionfi.com/0/j/d/mpc/index.html
Johannes of Rheinfelden
http://trionfi.com/0/c/01/
Master PW (EVIDENCE of 5x14-deck and a 5th suit)
http://trionfi.com/0/j/d/masterPW/
5x14-theory
http://trionfi.com/0/f/
Liechtenstein'sches Spiel (evidence of 5 suits)
http://trionfi.com/0/j/d/liechtenstein/
Master of the Playing Cards (evidence of 5th suit)
http://trionfi.com/0/j/d/mpc/index.html
Johannes of Rheinfelden
http://trionfi.com/0/c/01/
