I've been browsing catalogs at the Ninfinger site. It's interesting to note that the last year the bnc-55AO was offered as a separate part was 1974. They must have made a big batch of Goblin kits! Either that or it was an SPEV. That was also the last year for the K kit numbers. The kit from 1979-80 definitely has a balsa cone,that means they had at least a 5-6 year supply!

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Jeffrey Deem
NAR16741
CIA section 527