Star Model A First Model, this is the civilian model of the Guardia Civil's model 1922 pistol.
The civilian model had adjustable tangent sights as shown, and is chambered for 7.63 mauser. The First Model pistols are very rare! This one has the S/N on the butt of the pistol, S/N is A6854, 4 digit serial. Also has a lanyard and a backstrap cut from the factory for a buttstock!