Original Sequel's, built around 1986? serial #8810154/55.
Replaced both woofers, panels are original, as mentioned in another thread, they might need to be replaced but, they don't buzz, look great, sound great to me. They just have a very slight crackle when the amp turns on, very slight so I just keep them as is for now.
Mr. Powers mentioned thru an email he was working the line when these were built, he did a great job with the crossovers on these, they just have a magic about them, can't put my finger on it why. My EE/TE roommate who replaced the woofs said it was some of the finest engineering work he'd seen in awhile (about the crossovers).