They also make 1 + 1 = 2 with Maria-Maria. But it should always be written that it is "supposed" to be his pseudonym, except where there is no reasonable doubt: as when there aren't other uncredited actors in the movie.
Marina Morgan should be a different actress:
viewtopic.php?f=23&t=736&p=26241&hilit= ... gan#p26241
The case for Maria Morgan is pretty convincing to me for Lo sceriffo di Rockspring. Her character, appearing in the opening and throughout the film, is the leading female role (Cosetta Greco is top billed but she only appears later in the film) as she is a reporter that's doing a story on the little sheriff celebration. The first 13 actors in the scrolling closing credits, which are in the same order as the opening credits (except for Donal O'Brien who has a special credit at the end):
Only Maria Morgan is unidentified. The presence of the Maria Morgan credit in this movie's lobby cards clinches it for me. Of course it may not for others