Hoping someone can shine some light on what this speaker may be and what its rated. I imagine the 115 on the back of the magnet signifies that it's a single 15 inch speaker for the 1x15 cab but that's all I got from it. Any ideas on what the pencil writing on the inside of the cab may be or what the other numbers on the speaker indicate? I would greatly appreciate any information or wisdom you may be able to contribute. Thanks!