The very first MK-II's had a claw extractor but had no cut out on the bottom of the bolt face and were not true CRF. They only made these for a matter of months, maybe just a few weeks before the design was changed to make them true CRF. Might want to look at that. It is not a huge deal either way in my opinon, but being a 1992 rifle you could have one of these. Many who bought these had the boltface modified to be true CRF. Leaving it original would make it quite rare. I have no idea how that might impact future value, but it might.
Prior to the MK-II Ruger bought their barrels from outside vendors and accuarcy was inconsistent depending on who made that barrel. Ruger started making their own barrels with the MK-II and consistency improved. The triggers on the MK-II are generally poor though.
They have no real collector value (except for possibly the non-CRF versions) and would sell at about the same price as any other used Ruger in similar condition. I'd say $600 out the door is a fair price if in excellent condition, but not a steal. A new Hawkeye is about $650, but after tax would be just under $700 here. I'd pay the extra $100 for the Hawkeye, but many still like the stock design on the older Mk-II's better.
In 2006 Ruger introduced the Hawkeye. It is the same gun with some subtle improvents. The stocks are interchange, but the Hawkeye has a trimmer stock that I like better. It also has a much, much better trigger. They tend to be much more accurate than the older versions primarly because of the better trigger. The first Hawkeye's had matte finished metal which turned off a lot of people who prefered the polished blue on the MK-II. New Hawkeye's are now using polished blue.