Not necessary Landsknecht nor Katzbalgers , but Johann von Schwarzenberg's
Die Bambergische Peinliche Halsgerichtsordnung (Constitutio Criminalis Bambergensis) dated 1507 shows some nice messers:
Pic. 1 :Note the curved crossguard , "knifelike" hilt as well as curved blade/scabbard
Pic. 2 : shows the straight bladed variety of the messer ; note again the "knife hilt" ; the short crossguard is more typical of the earlier 15th century messers.
Pic. 3 : Throwing some (presumably, judging from the apparel) "landsknecht" type for good measure. The man on the right from the devil figure carries what appears to be an "early katzbalger". As has already been mentioned in this thread the early 16th century "landsknecht swords" seem to have only a slightly curved crossguard. Of interest is also the longer "hand n a half" grip.
Cheers ,
Samuel