[Milsurplus] How late were ARN-7 Radio Compasses (ADFs) in US mil service?

[Boeing377]

http://www.ebay.com/itm/151934890645?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT


Photo on eBay shows one with a 1971 rework logo and an emblem text that is hard to read but might be NAFL? 


Mark
AF6IM
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