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  1. #1
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    Bofors No. 12 primer adapter maker codes?

    The No. 12 primer adapter was used so that the smaller No. 12 primer could be used on earlier Mk I and Mk II 40mm Bofors cases that were designed for the larger No. 18 primer. The Mk I case had to have the primer pocket machined out to accept the adapter and were then designated Mk I*. Cases of new manufacture with this modification were designated Mk II. Mk I* or Mk II cases could accept either a No. 18 primer or a No. 12 with an adapter.


    Pictured are a Canadian AG (Aluminium Goods Co. Ltd) case and a British EB (Earle, Bourne & Co. Ltd) case fitted with the adapter and No. 12 primers. Interesting to note that the Canadian primer is a Mk IV. I don’t know the Canadian maker C/C of the primer and adapter. The EB case has been repaired or modified by LNE which I think is London & North Eastern Railway workshops and has been reused/refilled. If the case was modified, I don’t know what it was as it’s already a Mk II case, but now it appears to be a Mk II “dot” case.


    But what intrigues me are the maker codes of the adapter and primer on the EB case - these appear to be “M.O” and “MJ” - which are also the codes for Australian WW2 munitions factories. MO is Maribyrnong Ordnance factory and MJ was Hendon, SA. Unfortunately MO mainly made artillery guns and Hendon was No. 4 small arms ammunition factory, so manufacture of these components at those factories is most unlikely. What further throws a spanner in the works is that the primer was filled at CY Chorley, a British filling station. Given that the EB case was found and most probably used in Australia, I found that use of these maker monograms is a strange coincidence.

    Does anybody know the British makers of these components?

    Thanks, Graeme

    1a.jpg2.jpg3.jpg4.jpg

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  3. #2
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    The maker of the adapter, MO, is Marshall Osborne and Co. Ltd, Birmingham; the maker of the primer, G/N, is D Gilson and Co. Ltd, London. I can't find MJ - maybe from its position it is an inspection stamp.



    Tom.

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    Darkman (26th January 2018)

  5. #3
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    3MJ is the 'Series of empty lot number' The 3 denotes 1943, MJ represents Lots 2831 - 2840. This was a wartime practice.


    Letters AA represent Lots 1 - 10
    Letters AB represent Lots 11 - 20, etc.
    (The letter I was not used)

    TimG

    P.S.

    C/C is Crane Ltd., Toronto, Ontario. Originally a manufacturer of plumbing fittings, now greatly diversified.
    Last edited by TimG; 26th January 2018 at 07:08 PM.

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  7. #4
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    Thanks guys. Positively clears that up!

  8. #5
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    I quite like the 40mm Mk.1 and Mk.2 cases with the adapter.
    These are some of the ones in my collection. The other ones are mostly marked M.O. as well as this B:

    B40.jpg
    B?

    R&G.jpg
    R&G 7/42

    FIN.jpg
    FIN

    fmc.jpg
    FMC, this case has been reworked two times.

    40mmno11x.jpg
    And I have a 40mm Mk.II* case as well. Does anyone know the meaning of this * on Mk.II cases?

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    Darkman (11th February 2018)

  10. #6
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    B - This may well be Bryce Ltd., of Hackbridge.
    R & C - Reeves & Co., Ltd., Birmingham.
    FIN - B. Finch & Co., Barkingside.
    FMC - Flaherty Manufacturing Co., Hamilton, Ontario, Canada or Ford Manufacturing Co., Geelong, Victoria, Australia. The first is more likely.
    An asterisk generally denotes a modification.
    The first and last case are unusual it that the "II" has been stamped in Arabic, not Roman numerals.

    TimG
    Last edited by TimG; 10th February 2018 at 07:01 PM.

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  12. #7
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    I've never seen a Mk II * case. I don't know what this means.

  13. #8
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    I found another few 40mm cases with the No.12 adapter:

    40mm2.jpg
    TLC

    40mm1.jpg
    FIDDIAN

    40mm3.jpg
    And this Mk.I* case, dated 1/39. Who was this manufacturer?

  14. #9
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    TLC - Tilley Lamp Co., Colindale Avenue, Hendon, London, NW4.

    FIDDIAN - James Barwell Ltd., Great Hampton Street, Birmingham

    Last one - no idea. Can you show a picture of the whole head?

    TimG

  15. #10
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    Thanks Tim. Here are some pictures:

    40mmn.jpg

    aydk.jpg

    40mm1lne.jpg
    A bit hard to see for my camera. 40M/M I*

    stc:41.jpg
    Standard Telephones & Cables Ltd., London?

    Thomas.

 

 
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