Before there was DGG, there was DG.  In the early 1960s before forming what would eventually become Armi San Paolo and Euroarms, Giacomo Grassi and Giuseppe Doninelli, were involved in a small company manufacturing revolvers called Frabrica Armi Gradoga. The mark we see here, "DG", represents replicas made by them as well as the FAGS maker nark.

In 1971, when Gradoga closed, Giacomo Grassi, Giuseppe Doninelli, along with Silvano Gazzola, (DGG) joined with Luciano Amadi (who already had a small gun trading company) to form Armi San Paolo in a small town 25 Km south of Brescia called San Paolo.