Helix, before the "last ditch" Type 99's were being built, the Japs did chrome the bores.
A friend brought one over to have me clean, bore was rusty and had a muddobber nest in it. I figured there was no hope for it. Ran a bronze bore brush through it while I flushed it with brake cleaner. Ran a patch through it to see how badly it was pitted, and about fell over when I saw a pristine chrome bore. You won't find the chrome bores, or the quality in craftsmanship on the rifles made near the end of the war.
dennymac, value depends on condition, arsenal it was made, number made at that arsenal, if the "Mum" is scrubbed or not, etc.
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Aim small...Miss small