Originally Posted by MarTONEbass
Watts? Well, I have no accurate information. It's a vintage speaker, so I don't think it's very high powered by today's standards. Maybe 100 watts? Maybe more? Probably depends on the cabinet.
This is what I found from an ad from a speaker that looked pretty much identical:
IT IS A 15", 8 OHM SPEAKER WITH AN ALUMINUM DUST CAP, A 2" VOICE COIL, AND A 54OZ CERAMIC MAGNET. A CONSERVATIVE THERMAL RATING BASED ON A 2" VOICE COIL IS 100 WATTS.