I sold a good number of Moss Tents right before & during the MSR acquisition.
I, too, have a few of them, as well as a couple of the wings. If I ever have the heart to depart with them, i hope to cover a little of the kids' tuition.
They are the epitomy of beautiful design, and impeccable workmanship. Although heavy, they were far better that any other tents we sold at REI, in the opinions of many of us back then.
That being said, the label (on the fly, notably) has the appearance of the mid 90's model, right before they left for Seattle. I believe the fly label before that version was more of a silkscreen.
There is a shop up in Camden which still repairs Moss tents. I'm sure the guys in there will help you out.
Definitely an Olympic, though. The sales vary on those models. The last one sold on eBay went for $260, whereas an even older Moss Encore went for $1,654.
Good luck with it. It's a great find!