On eBay Now...Western Electric 425E Impedance Matching Network Anti-Sidetone Original Box '69 For Sale
Western Electric 425E Impedance Matching Network Anti-Sidetone Original Box '69:
$19.99
Offered is the Western Electric Impedance Matching Network type 425E (Anti Sidetone). The unit is clean and in good condition-it appears unused. It is offered in its original moistutre-proof packaging. Probably originally for the Military. Pick up the network for your own vintage phone system. Untested and offered "as is" due to age. !! Thanks for looking. 
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