Many thanks for the suggestion.
The shaft is octagonal at least as far as the ferrule (but, of course, I can't say whether it continues to be octagonal under the ferrule without taking the spear apart). The cylindrical ferrule on this spear contrasts with the octagonal ferrule on the spear posted by CharlesS.
The octagonal section continues to the butt. However, if we assume that the thin copper wrapping on the butt is a later repair, then it is also possible that the shaft might have had its original end cut off.
I don't know if this is important, but it did strike that (compared with the FEW other S.E. Asia spears I've seen) that the head seems to have an unusually long shaft.
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