Pooka:

Its the old Tamiya 56002 Leopard or 56003 Gepard chassis (they used the same chassis, & samel clutched gearboxes with slight variations in the motor mounts. Sadly, parts for these chassis are rather hard to come by (roadwheels & polycaps that held them on are unobtanium) as are many of the styrene hull parts (rear chassis plate, turret, etc)

You see 'em up on eBay every so often, and one of questionable quality went cheaply last week for under $110 US. I asked about the roadwheel rubber 9its prone to dry-cracking at over 20 years old) and seller wouldn't answer, so I dinna bid. Another down in Auz was near-new (just built up and not yet complete) and went for over $400 US.

It all depends on your luck... and who else is looking that week. You want it for the chassis, you could try one of the Leo 2A5/2A6's made, or the 1/16 hobby Engine Abrams, or at the high end, the Tamiya Leo 2A6.