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British Mk 3/4/5 shell manufacturers stamps

Article about: We're talking about the British Mk 3 and Mk 4 helmet shells. There are two points. It turns out there's some degree of uncertainty as to the actual production years of these helmets, especia

  1. #1

    Default British Mk 3/4/5 shell manufacturers stamps

    We're talking about the British Mk 3 and Mk 4 helmet shells. There are two points. It turns out there's some degree of uncertainty as to the actual production years of these helmets, especially as to when they ceased production. Also, there is a theory, propounded by the estimable Roger Lucy, that Knowledge can be obtained from examining the batch codes stamped inside most (but not all) of these helmet shells.

    Popular understanding has it that the Mk3 (that's the one with the bolt-in liner and the high-set chinstrap lugs) came into production in 1944, with the revised version, the Mk 4 (lift-the-dot liner, lower set chinstrap lugs) in 1945 (contract awarded December '44).

    It isn't clear when production of the Mk3 ceased, though it would be reasonable to believe it would have been at the time Mk4 production was started. It is said - Cotton, MILITARIA MAGAZINE article 1995 - that 1-million+ Mk4 helmets were ordered in December 1944 - but Cotton himself later implied that few were actually produced soon after. It is thought - perhaps wrongly - that there were two bursts of production, one immediately at the end of WW2 and the other during the Korean crisis of the early 50s.

    Given the present lack of the promised book by M Cotton which will make everything clear, the best we can do is try, by looking at the actual shells, to establish a fair idea of the period(s) of production. It is generally believed, for example, that there are *no* shells dated after 1953. Is that true?
    So the task is simple but difficult. Just examine the shells of your Mk3 and Mk4 (which includes the notional Mk5 which is after all only an old Mk 4 shell with a different liner and a fresh coat of paint).

    The difficult part is that the manufacturers stampings can be hard to locate, hard to read, and maybe not even there in the first place. And may have been totally obscured by many coats of paint. Look under the front brim, or around the chinstrap lugs. Stampings can be aligned either horizontally or vertically. There's no pattern or sense to it.

    What you will be looking for is a grouping of letters and digits that will probably (not always) comprise something like this -

    RO&CO CA 1952 4

    but *not * in a line like that. That information is the manufacturer (RO&CO, or BMB), a batch code, the date, and the mark of helmet (this could be 3 or 4, or III or IV).

    These stamps are often very lightly struck and will be difficult to read - use a bright light angled against the metal to bring out the lines. Even if you cannot make out all the characters just the maker and date will be good.

    The more I (and Roger) have looked into this the more we realise the published information is inadequate and that the more we find out the less we know. This is useful research, please help.

    This is what I have been able to read from part of my collection (some unreadable, some inaccessible at the moment) -


    RO&CO DO 1944 III


    RO&CO FS 1945 4
    RO&CO FS 1945 4
    RO&CO FF 1945 4

    RO&CO DI 1952 4
    RO&CO CA 1952 II (that's really what is there!)
    RO&CO MA AD 1953 4

    BMB A3 (no date) 4
    BMB C791 (date unreadable) 4
    On the basis of this sample it does seem to reinforce the idea that there *was* indeed a substantial batch produced immediately after the Mk4 contract was awarded. And the Korean War crisis run seems to be reflected also. And is it really true that no shells were pressed after 1953?

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    the MKIII I own does not have any markings on the shell that I can find, I checked again and had looked previously, but none can be seen.


    Whatever its just an opinion.

  3. #3


    Jerry, that's entirely within the norm - I reckon that with very light stampings, thick overpaint, or sometimes no stamp in the first place, about 20percent of these shells will give no information. But I would advise people to be patient and use a bright light angled against the surface. There's no consistent placing for these stamps and they can be almost illegible. Size varies too - the 1944 ROCO I have is very large, whereas the BMB stamps are surprisingly small - I found one only on the third inspection.

  4. #4


    My Mk IV stamps were very hard to find, even though the helmet seems to have the original black factory finish on it. I finally found them stamped vertically at the front of the helmet.

    The stamp reads:
    C89 1952

    The liner reads:

  5. #5


    I have four shells. Three are marked with Manufacturer, Mark, Two 2 letter codes, and a year
    RO&CO 4 UK (OK?) MA 1952
    RO&CO ? OR MA 1953
    The last is really a mess
    RO&CO 4 ML 1953
    The "ML" is actually overstamped over the end of "CO"
    All are painted solid black and show no evidence of texturing. All are of course MK IV shells with LTD fasteners, no liners, and rotten elastic chinstraps.

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    Greg My mkIII shell is clearly stamped RO&CO The batch code is EB , III/1944 British Mk 3/4/5 shell manufacturers stampsBritish Mk 3/4/5 shell manufacturers stampsBritish Mk 3/4/5 shell manufacturers stamps

  7. #7


    Hi all
    my solitary MK 4
    RO&CO 4 R 1952
    Click to enlarge the picture Click to enlarge the picture British Mk 3/4/5 shell manufacturers stamps  

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