I spoke to Marin again regarding the different number sequences that were used.
They say that there were some variations across the years, but essentially the beginning and end never really changes.
The Factory is always first then the model and year. Different codes were used for the year. Don't forget that frames will have been made well in advance in the far east and then sprayed in the US a month later perhaps. So, your 1991 Marin may be a 1990 frame. Only a day seperates the years!!
The other constant is the final part of the code which is the frame number in production. The other bits within the code do alter and even Marin themselves can't remember them all. Why would they need to? It's not likely they'll be returned now.
I am not the most knowledgeable person to ask, but I give the knowledge I have, which came straight from Marin themselves. I only have one steel frame, so the conversation was brief, as they could tell me straight away about my particular code. I didn't need to ask any further for each of the years they produced frames as they used different coding techniques. My Titanium frames are all different and do not all carry Marin codes.
Feel free to call ATB Sales and have an in depth conversation regarding your particular code. I'm sure they'll oblige.
1990 Marin Team Titanium, 1991 Marin Team Titanium, 1993 Marin Team Titanium, 1994 Marin Titanium FRS, 1995 Marin Team Titanium, 1995 Marin Eldridge Grade, 1996 Marin Team Titanium, 1998 Marin DH FRS, 1999 Marin Team Titanium, 1999 Marin Mt. Vision Pro, 2000 Marin East Peak, 2002 Marin Mount Vision
1988 Concorde Colombo, 1997 Colnago Master Olympic, 2005 Look KG481-SL, 2009 Look 586
WANTED: Marin Titanium - pre 1990, 1996 FRS, 2007 25th anniversary