As far as I know there isn't a way to identify the model from the serial for this period, but the serial tells us it was made August (I think!) 1996, so possibly a 1996 model but more likely an early 1997 model.
I also found the few sets of 170 mm cranks I've tried uncomfortable and actually got knee discomfort from long rides with them - could have been another factor in there though. I haven't done back to back comparisons with longer length cranks, but I have afew sets longer than 175 which I find...