Unfortunately I don't have much detail about the machine pictured here. What I can tell you is that it was purchased in its current refurbished condition in September 2012. I believe this machine could be a 1990/91 Marin Pine Mountain, but if that information is wrong, I'm more than happy to be corrected. From what I recall being told by the original owner, the bike was purchased brand new in the USA whilst he was there on holiday with his family.
My Marin Pine Mountain Bitsa
When purchased by me, the bike was fitted with drop bars. However I have Hemiplegia and as a direct consequence, I found it incredibly difficult to operate the right side Shimano STI lever. Fortunately my problems were solved by fitting the Moustache bars shown above. Using these handlebars enabled me to rotate the STI levers to a position where the stiff fingers of my right hand could reach them...I can now both brake and change gear fairly easily, something that was previously almost impossible. As an added bonus and unlike any straight MTB bars I've encountered, Moustache bars also allow the use of multiple hand positions.