A brief history of the Star Modelos Super.
First a brief note on reference material for Star Pistols. The Star factory had a habit of changing characteristics on it's firearms without changing model names. Therefore you may find conflicting information than given here, and your Star may exhibit characteristics not mentioned here.
The Star Modelos Super were produced by the firm of Star Bonifacio Echeverria S.A. in Eibar, Spain.
After World War II the engineers at Star dusted off the plans for the Modelo M (9mm Largo/38 ACP) and decided some improvements were in order. The Modelo M continued to be produced, but the Modelos Super made improvements on its design and were produced from 1946 until 1983 when it was discontinued. Over its life, the Supers were offered in seven chamberings. In 1946 the Super M was debuted in 9mm Largo and 38 Super, soon the Modelo A (9mm Largo) underwent 'Superization' to become the Super A. Later that year the Modelo C (9mm Browning Long) was 'Superized as well, but was only produced in limited trial quantities. The Modelo B (9mm Luger) was also modified in this year to become the Super B. The year 1948 saw the addition of the Modelos SI (.32 ACP), and S (.380 ACP, 22 ozs.). In 1950 the Modelo D (.380 ACP, smaller than a Super S) was modified, in 1958 the Modelo P (.45 ACP) and finally in 1971 the Modelo SM (.380 ACP with adjustable rear sight) was modified. Production of all Super Models continued until 1983, except for the Super C (1946 only), Super D (1950 only) and Super P (1958 only).
The Super A and Super M were produced concurrently in 9mm Largo and .38 ACP. The two differences in these models is an enlarged breech face on the Super M that will allow the semi-rimmed .38 ACP cartridge to fully chamber and the Super A weighing 2ozs. less than the Super M. These pistols have their barrels marked 9mm/38.