Potentially rare Portuguese M113A1 with M40A1 recoilless rifle. Elsewhere in the world it’s a very common mod but in the context of this tree I don’t believe Spain or Greece created such things.
The M113 family Interest Group | Portuguese M113A1 field modification. | Facebook
Would make for a good light tank between 5.3 and 6.3 seeing the lower mobility and larger profile than the FIAT.