i just read the below quote.....and wondered if it is correct and Glenn Branded cab is not actually a real Altec Cab.???????
Many times cabinets were custom made back in the day, using Altec components. In fact, what got me into this hobby about 15 years ago was when my Grandfather gave me his entire Altec stereo system. He bought the system brand new in 1962. He had all of the original paperwork, price sheets and catalogs that were marked up with his notes (even the same warranty card as in your picture). The speakers were also the 602D's with 3000 crossovers. The cabinets were custom made to Altec's specs by a company in Arcadia California (near Los Angeles) called Glenn. I belive they were a fine custom furniture manufacturer that did great hi-fi cabinet work. I would have never known who made them if I didn't have the receipts, plans and notes. I would guess those are late 50's to early 60's and probably built to the same specs as the cabinets I had.
There should be a date code on the speakers, 6 numbers that will give you the week and year at least the drivers were born.