The Mountaineer II came out in 1990. The early ones were numbered. I am unsure what number they stopped at for each model. I have other numbered ones that were made during this time as well. If you want to know any CRK info, Che k out my CRK history timeline in the sticky.
Not really. Of course, they may narrow it to a range of 2, 3 years. But dont expect too much. They did not take records of their production numbers and also not of the numbered pieces. That is the reason why they stopped numbering them. It just doesnt tell you anything if you dont keep track of them. Without having the birthcard at hand you wont get anything better than their best guess, I am afraid.