Unknown stamp on T scope bracket

[smle addict]

Hello all,

Found this a few weeks ago. It was advertised as an original T bracket, and the price was relatively cheap (less than the repros). Took the gamble and bought it. It has a mark I've never seen before, looks to be an encircled B6 over R2. Small "M" inside of the bracket, just above the rear screw.

Any ideas as to the marks? And is this an original?

Thanks

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