vintage coral speakers

Trying to find out any info. on some coral speakers I have. The cabs seem to be from the 50s. Each cab has one coral 15L-1 15" woofer, two coral H l tweeters, and two pioneer PM-500 horns. The cabinets seem to be diy cabinets, because I can't find any brand name, model #, or serial #s anywhere. Any ideas?