I have a pair of small drivers (horns? tweeters?) which I believe to be Altec products. They are light green and the faces measure approximately 2 1/8" H x 3 1/8" W. The round metal plate on the rear is marked "391834" and "ALC" and "19". The ALC and 19 are enclosed in a square with a horizontal line seperating them. Any help identifying these and perhaps which Altec models they were used with would be appreciated. Regards, Gary