Update: Identified as a 1996 Model with monococue type frame.
My bike has a neat early 1990's style primary color paint scheme much different from the catalog.
In contact with the folks at Marin making some progress!
Oval stickers on frame are from Bromley Mountain in VT thinking this may be an important clue. Left a message on their site seeking info perhaps they were rental mountain bikes for use during the summer season?