In late 1977, by the time Estoril was discontinued, a heavily revamped version of the Alpha is presented, Alpha 77, with design motifs new to the Portuguese coachbuilding scene, such as windows with square corners and thin pillars covered by black frames.

The model would receive another two facelifts, Alpha 80, by the end of 1979, with very few differences from 79 and by 1981, Alpha 81, that introduced the two stripes front topping design and front turning and position lamps moved from the panel under the windshield to the side of the headlamps.

In 1970, Salvador Caetano and Magirus-Deutz AG signed a partnership agreement in order to produce integral buses, this agreement had a somewhat slow start as Volvo B58 kept being a much more common choice for Salvador Caerano customers.

The Alpha, in fact, assured the success of the technical partnership as most of the coaches built were based on Magirus-Deutz mechanics.

Chassised versions of diverse manufactures were also offered and the coaches could be ordered with Pegaso, Volvo and Scania mechanics.