The "Complete Book Of Firearms" by Sergio Masini & Gian Rodolfo Rotasso, a translated version of the original Italian publication, shows several almost identical guns and calls them, "sixteenth-century matchlock arquebus (Italy, c.1570)." One is quite plain like the one shown above while the secondis quite heavily decorated with guild coloring, grotesque carving and MOP inletting. There's a third illustrated with an early flintlock and called, "...a flintlock weapon with a Roman-Style lock probablymade in Brescia at about the same time (...from the end of the seventeenth century). The lock plate appears to be converted from a wheel-lock gun, though it's not certain if it was this gun. The Italian authors use the term "arquebus" for anything before flintlocks. Still, there's a lot of neat stuff in Italian museums.