Spatha/Pugio and the 4th/5th C Germanic Warrior

[ioannes sebald]

Wassail!.Having recently opened a debate with a compatriot over an old argument i was told that a Germanic Warrior,c400C.E could not have worn a 3rd Century C.E Spatha and Pugio.Is that opinion valid?,i put forward the notion of"heirloom pieces"but it did'nt stick,so,who is correct on this point?,and why?,if anybody has an answer please post it as it's driving me dafter than i already am :? .