In the mid 70's I was working as a construction project egineer in NYC. I had just finished building the Sherry Netherlands Doubles Club Disco with a friend Winn Schwatau(a sound engineer). In 1974 or 75 (memories fade) we were called to survey Electric Lady Studios on 8th Street. To make a long story short, I obtained 2 Altec 604e's in 612 cabinets from ELS. I need to authenticate these speakers. From what I understand serial numbers were lost in an earthquake in 1993. Is that true? Does anyone out there know of where I might find a picture of Jimi with these speakers or a picture of them inside Electric Lady. Any other ways to authenticate them through Lansing documents? The speakers still sound awesome! I have been working on this matter for some time. HELP!!!!!!!!!!!!!!!!!! I would be more that grateful for some anwers or suggestions!