REX, .25ACP, 6 RD:

ORIGIN – SPAIN
CALIBER – .25 ACP
WEIGHT – 13 OZ.
OVERALL LENGTH – 4.5″
LENGTH OF MAGAZINE – 2.53″
Made by Gregorio Bolumburu, marked Pistolet Automatique, though the gun is definitely a Spanish copy of the 1906 Browning.