There are two grape varieties with this name:
The red grape variety is a new breeding between Chatus (Nebbiolo di Dronero) x Dolcetto. Synonyms are Dalmasso 7-21, Incrocio Dalmasso VII/21 and S. Martino. According to DNA analyses carried out in 2009, the breeding list entry Nebbiolo x Dolcetto was wrong. The cross was made in 1936 in Conegliano (Veneto) by the breeder Giovanni Dalmasso (1886-1974). Incidentally, the same parents also produced the new varieties Passau and Valentino Nero. The variety is cultivated in Piedmont. In 2016, 6 hectares of vines were reported with a falling trend (Kym Anderson).
In the past, you needed a wealth of encyclopaedias and specialist literature to keep up to date in your vinophile professional life. Today, Wine lexicon from wein.plus is one of my best helpers and can rightly be called the "bible of wine knowledge".Prof. Dr. Walter Kutscher
Lehrgangsleiter Sommelierausbildung WIFI-Wien