There seems to be some confusion as to how long the Czech "lion", "lion/N" and "N in shield" proofmarks were in use. The Czech authors J.Gargela and Z.Faktor in their 1985 book "Zeichen auf Handfeuerwaffen" state that the design of these proofmarks was changed very slightly in 1962, bolder lines and different lion's leg and tail shape, but they continued in use "up until today (1985)".