It doesn't look like the original leather. It should be a light grey (like you see on the centre arm rest), not dark grey like it is. 91's had light grey leather in the shadow grey interior, 92's had black leather in the shadow grey interior. The owner might have swapped in some of the pieces from a stock 92 interior, but in some of the pictures it actually looks like a dark grey, which was never offered from Toyota. Maybe he had the leather dyed?
Still very nice, the interior just confuses me.
EDIT:
THIS WAS THE LAST FULL YEAR OF PRODUCTION
No it wasn't, 1992 was, and 1992 was actually an extended production year, lasting longer than any other model year Supra (including MK1, MK2, MK3 and MK4).
Jeff