This is a Small Micro Machine Plastic M-551 Sheridan Tank in Dark Desert Camouflage.   It is made of plastic and are highly detailed, note the blocks of reactive armor.  It is about 1 3/4 inches long.   I bought this as part of a job lot and it is in very good condition.  The coin in the picture is a Dime to show just how small this item is.

I will gladly combine these small items to save on the shipping.