The picture of the Ti Bolt in my '93 Rocky Mountain catalog has the cable stops on the top tube. That eliminates '93 as a possible production date.
There are bigger differences than that, since this isn't a Ti-Bolt. 1993 was the first model year of the Ti-Bolt.
1989 first year of production, no other info or picture
1990 Polished finish , 27.0 seatpost ~16.7" chainstay length (except 23" @16.9")
1991 Polished Finish, 29.2 seatpost ~16.9" chainstay length (no 23") -also the cable stops on headtube feature
1992 Etched Silver, 27.0 seatpost, 16.7" chainstay (no 23") 2" suspension geometry, head/seat geometry steeped and seat angle is now size specific. Can only assume this is rigid angles
Note that 1991 has nice picture, 1992 has tiny one also like the Altitude the pictures do not fit with the spec description so well