From what I can tell Ertl only made 3 kinds of "tanks". And they made them in two different years... 1988 and 1989. The ones made in 1988 have the name of the "tank" in purple, and the ones from 1989 have the tanks name in yellow.
Hardest to Find Mint
All are kind of hard to find, but lately they have been popping up on eBay a lot.
(Based on how many are normally seen for sale.)
|1988||M109A2 Self-Propelled Howitzer||1140||Click Here|
M1 Abrams Tank
|1988||M113 Armored Personnel Carrier||1145||Click Here|
|1989||M109A2 Self-Propelled Howitzer||1140||Click Here|
|1989||M1 Abrams Tank||1143||N/A|
|1989||M113 Armored Personnel Carrier||1145||Click Here|