874a system

[profsteve]

I've been an Altec and JBL lover since the 50's. I have recently acquired a pair of 874a bookshelf systems and am a bit confused about the components. The low frequency drivers are rather heavy and although ALtec products are not labeled so. The 391221 code tells me it is indeed Altec and that it was made either in 62 or 72, but the other series of numbers on the low, mid and tweets are a mystery to me.
Low is 30942 whereas mids are 30952 and tweets are AD 160/T4. What actual models are these?
Thanks

[whatever1]

Hello

anyone have pictures of a Altec 874A ?

[bfish]

The one on the left;

http://www.lansingheritage.org/image...ome/page22.jpg