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Does anyone recognise this 12AU7?

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sharpi31

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Joined 2005
#1
I purchased these 6 tubes in an ebay auction:

Does anyone recognise the 'donut' shaped logo on the third tube from the left?

I think the others are (from left): Brimar, Marconi, ?, Amperex, Telefunken, Mullard.
 

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#2
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.
Les
 
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