It seems to be identical to the 1966 series, built at the same factory (PAFAWAG) probably it's just the same wagon.
They are though differently numbered.
21 73 131 1 025-174 Gs, 150 units and 21 73 131 1 175-224 Gs-v, 50 units
21 73 131 1 145-2 Gs at Agios Ioannis
21 73 131 1 155-1 Gs, minus the buffers, Agios Ioannis
