Those are 872A's, and their worth is essentially determined by the going rate of the Biflex woofer.
In general, anything less than $150 is a real good price, and up to $300 would be the going market rate.
As for sound, well they're not going to sound like A-7's, but they still have much of the Altec midrange magic. They also are a good candidate for some tweeter mods.
I just got a pair of GPA MR-931's in the mail today, and with some 902's on the backside of them, they may sound right much like your A-7's....:2thumbsup:
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