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.