Manufactured by Fausto Carvalho at Rua do Comércio, Sangalhos. Most of their machines were produced by other manufacturers but possibly the model FC was their own. Other models included the Diana Mini, Mini G2, G3 and Mini Cross. Engines were from Casal, Durkopp, Sachs, Zundapp and others.
Source: Motos de Portugal
N.B. The name Diana occurs in association with several other marques. See Disambiguation