[NJARC] What is this?

[Joe Giliberti]

I picked this up at the Collingwood market yesterday. The seller looked at
me and said 'you must be into old radios since you know what that is' I
nodded my head and left. It looks like some kind of tuner but it's not an
air cap. Almost looks like that was on my crystal radio kit when I was 8.
Please enlighten me!
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