It looks like a T54 (T55 has a muzzle evacuator). I'll bet on mine damage, see how the track is ruined (bottom right of picture). No Superpug1 it does not look like it has been hit by a Armor Piercing Fin Stabilized Discharging Sabot Depleted Uranium 120mm round (btw. it's a projectile not a missile).
I bet on AT mine damage.