Please help ID this 12AX7

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Hi. I have recently acquired this 12AX7 tube at eBay. It was claimed to be a Mullard-made 12AX7, but the tube's internal construction is not like any of the Mullard 12AX7's in my possession.
The printing says "12AX7 DYNASCAN 1022-752 GT. BRITAIN." It has shorter and a little wider "single-stapled" grey plates and a very small getter halo(SEE Pictures). There is no Mullard manufacturing code like Bxxx.
Please help ID this mysterious 12AX7. Thank you very much in advance for your valuable insight.
Regards.
M. N.

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Topic - Please help ID this 12AX7 - mnaka 04:45:50 06/05/04 (1)

Re: Try this link for photo--Please help ID this 12AX7 - mnaka 06:59:16 06/05/04 (0)

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