I'm pretty sure Squibb is correct about it being an older 750cc. Of course since jargle's avatar is showing a picture of what appears to be a 750 Tenere . . . . that's kinda cheating.
Welcome! I really enjoyed owning an XTZ750 - the motor seemed uncannily smooth to me at the time and I spent a few happy hours spraying the headers with sperex vht. Nice sound with a Laser race can too. The seat was very cosy with a pillion!