Someone posted here eons ago about the long-absent 21st Century Toys 1/18th scale M48A3 Patton.
Just an FYI - they have been re-released and are showing up on e**ay. They now have a full diecast hull, but no figures or wading snorkel - which were present in the original all plastic version years ago.
Regardless, they look like a scaled-up Tamiya M48!