An unfinished neck will soon look dirty and gray as I'm sure you must know. Years ago Gibson came up with the idea of having an unfinished neck on a classical guitar. It had wood filler in it,but no finish. No one would buy it,and soon dealers who could were spraying finishes onto their necks. This was in the 60's. They also used a DECAL for the rosette!! some were sloppily trimmed near the fingerboard and could be seen for what they were. How CHEAP could Gibson get????
I have mentioned this before,but in the 60's I found a source for spruce tops,already smooth and joined down the middle for $1.50 each. The supplier told me they were selling the same tops to KAY guitars. Thing was,those tops were a 1/8" thick sliced veneer. Every grain had been broken during the slicing process,and you could literally bend the tops into a circle!! No strength at all. They were all made from an extremely tight grained Sitka spruce,but it must have been soft spruce to have allowed cutting into veneer like that. I think the hard and the soft grains were nearly identical in softness. I have seen plenty of wide grained spruce that was plenty hard. It depends upon the minerals the tree grew up with more than how tight the grain is.
So,I wouldn't buy any Gibson newer than the 50's,unless it is a new Montana made Gibson.
Oh,I also saw a Hummingbird with brash thickness planer marks all across the back. Even came through the finish. Not sanded at all. What miserable garbage they were apparently turning out in that era. Just my opinion,based on what I saw. But,I wasn't stupid.