I believe FP is right on the czechoslovak captured material, there is no sign of stamping material with SS or DH same as no marked on WKC blankos or other commerzial bayonets that were used by W-SS. Some exception are from the early prewar period. All the upgrades of old Gew98 were mainly commerzial done.There is no reason to marking inside of grips for SS property, as is no visible by normal view. Certainly not on Vz.24 bayonets.best regards,Andy
PS its confirmed that already 9 of 10 DH or SS markings are fakes as its very interesting link the items with SS or W-SS. Its sale politics.