Hmm, can't be absolutely sure, but doesn't look like a complete/stock works '93.
Seems like he's running brushless with lipos, but at least the TCS system (slipper clutch) in in there otherwise the drivetrain would probably melt!
I don't see the torque rod brace for one thing. The steering system looks more like that you would find on a works '91 or yz10 '94. More pics would be useful if you seriously intend to buy.
Still, a works '93 is worth plenty...
Personally, if I had a car like that....I'd race it to death
Anyhow, judging by the comments above I think I wouldn't be very keen to barter....