Mid 20th cent Saka knife?

[katana]

Hi Tim,
its highly likely that the woodworm is long gone, the holes are where the larvae have borrowed out, emerging as adults (beetles). However, if there are 'saw dust' deposits then the grubs are resident/active. The freezer idea seems a good one....to be on the safe side. At least it will save using harsh chemicals....that would probably affect the colour/appearance of the handle.