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Do you think it might be
R M and B

Richards Mabbutt and Batley ?

I have made some progress on tracking down this makers mark

What I took to be T Mabbitt which was a double struck makers name under the barrel would seem to be T Mabbutt of the Abingdon Works.
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Tentman remove one small screw and the block comes out the top

Yes the dual actuators mean it's a very smooth action

Rifle was thick with grease and rubbish

242497

What makes the Field's such a good action is the low number of parts

242498

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Another image

242495

Additional info

It has a stamped maker or assembler under the fore end on barrel

Bump

Another image

242495

Additional info

It has a stamped maker or assembler under the fore end on barrel

I fired this rifle this morning and rambo-6mmrem fired his Martini 450 no1 Express as well
Pretty awesome having two circa 1880 450 no1 Express rifles together shooting the same loads

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450 #1 Express BPE

Bore is nearly mint

" T Mabbitt " on barrel under fore end

Single barrel
Field's patent falling block
Henry rifling A&T barrel