I believe the "R/C'd" Mark IV's from 21st Century were billed as the products of an outfit called "Motorworks"...... This could be a "custom" paint job....(Note the white dot in the middle of the cross, and the missing MG on the Turret mount).

The 21st 1:18 tanks, by the way, were sold here in Canada not by Wal-Mart but by "Toys R Us".