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Here's some pics of the MkVI adapter with the MkI metal igniter (All inert) Clearly marked as a Naval issue piece and marked with maker 'I or J Stone & Co Ltd'
Here are some other primers that may be of interest to some..
1st pic: Comparison of MkVI adapter & metal igniter with a MkV Primer Electric Large.
2nd pic: Rear of MkV Primer Electric Large made by Royal laboratory Aug 1902.
3rd pic: MkVI adapter, Naval, Made by Grammophone Company (on 1917 dated 12pdr 12cwt).
4th pic: MkIV adapter, Naval, made Royal Laboratory, (on 1907 dated 12pdr 12cwt).
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