Early Generation Unfrosted Tip MN21?

ebuchner

Enlightened
Joined
May 28, 2017
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278
Has anybody here ever seen/used an unfrosted MN21 in the wild? I was browsing an auction site and came across what appears to be an unfrosted MN21 in an M6. It's kind of a fun curiosity that I wanted to share in case anybody else wanted to oggle at it or chime in on.

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The problem with that is that the MN20 is a tip-frosted T1.5 lamp, but that's definitely a chunkier T2.5 envelope. Maybe someone just stuck an N62 in there? That's the only T2.5 lamp they offered (that I'm aware of) that came standard with no frosting
 
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