richland arms dlb 20ga

i have a richland arms double barrel 20ga, given to me by my grandfather. he always called it the "matador". it does say mfg in spain. the only other thing on the barrel is this... "GZARALY CIA S.A." but the i and the a after the c are really small. it does also say on the barrel that it is chambered for 3". any info on this gun would be great.....//fd