I have three 511B 24" Altec Lancing horns that have been up in my attic for the last 21 years as my wife would rather see me hang then allow these in the family room. The label on the iron drivers is long gone the only id on one of them is a black marking 391745. The back steel cap on one is missing as well as the plastic cap for the diaphragm. Two different steel caps on the back of the other two drivers. For my office I am using two 604-8G studio monitors.
Attachment 66865
Note the pictures were taken yesterday, did not know the default date was on due to changing batteries. Do these look like 902A?
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