Does anyone know why made these 6550 tubes for Cary?

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I meant who,not why.LOL

They read made in USA and they sound absolutely incredible and they came in a factory built Deuce I got on Ebay a few years back. They look like GEs or possibly Sylvanias but the bottom taper is what's throwing me.It seems to me that one of the plate holes are rectangular but I would have to dig them out again to verify it.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

Edits: 04/23/17 04/23/17

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Topic - Does anyone know why made these 6550 tubes for Cary? - Michael Samra 17:55:34 04/23/17 (7)

My first impression is Russian made - DAK 11:04:44 04/25/17 (0)

Pretty certain I've seen these branded Mesa, so perhaps some guitar... - DeKay 18:32:26 04/24/17 (0)

RE: Does anyone know why made these 6550 tubes for Cary? - FenderLover 08:21:56 04/24/17 (0)

RE: Does anyone know why made these 6550 tubes for Cary? - SETdude 04:30:53 04/24/17 (3)

RE: Does anyone know why made these 6550 tubes for Cary? - akolegov 10:15:17 04/24/17 (2)

RE: Does anyone know why made these 6550 tubes for Cary? - SETdude 14:03:15 04/24/17 (1)

RE: Does anyone know why made these 6550 tubes for Cary? - akolegov 01:54:52 04/25/17 (0)

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