Looks to me like the trade mark of Bentley Acoustics. They were a company that supplied valves by mail order but the country of origin was variable. I have for example a Bentley Acoustics 5Z3 that was made by Westinghouse in Canada. I think they re-badged a lot of ex-military valves and also many from other countries like Italy, Germany and Russia. Pinnacle and Z & I Aero were similar companies.
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