[Boatanchors] Headset Identifiaction help requested

[Greg Mijal]

Hi:

Went to the local flea market today and came back with an interesting pair of headphones from yonder times.
Can anyone help me identify them? Any electrical data will be helpful.
Here is data I found on them:
Pads are marked: NAF 48490-1
Headband is marked: HB7
Receivers are marked: ANB-H-1
Photo:
http://home.earthlink.net/~bluebirdtele/ql.jpg
Thanks for your help.
Greg
WA7LYO
in sunny Feenix