Jeff,
The last post was correct on the Spirit of '76 knife. We made a lot of them and they are relatively easy to find now. Still a nice looking knife for a collection in my opinion. The Akanua and the Kalinga came out in about 1970. The Kalinga was first. Al Buck wanted a nice knife that sold in the more expensive (at the time) range of $50. The earliest ones had black fibron handles and later we switched to rosewood colored handles. Your best bet on current value is to check out one lf the online auctions and see what folks are getting. They are on there all the time.
I find it amusing but they are often advertised as "Rare" or even "one of a kind, never in production". We made about 60,000 of the Kalingas and about the same amount of Akanuas before they were discontinued last year.
Hope this helps,
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Joe Houser
Director of Quality, Buck Knives Inc.
Buck Collectors club Administrator