Here's an interesting thing I found on Ebay a few weeks ago. Its a 1984-dated Mk6 from a maker I had previously not known about, TRITON OLIVER LTD, who seem to have been active in the West Midlands up until the middle 1990s when they closed down or were absorbed into something other. They were in the plastics moulding business apart from anything else, and were obviously one of the other few companies like NEI who produced early runs of the GS Mk6. I guess we will have to wait (and oh how I hope to live long enough) for Marcus Cotton's fabled book on BRITISH HELMETS to find out more, which I hope will include a full list of Mk6 makers. I live in hope, which is why I keep buying lottery tickets.
Anyway, this is pretty much a Mk6 EXCEPT for the the fact that like other very early runs from NEI and perhaps indeed the main contractor NP, it does *not* have the extra breakthrough holes on the side-wings for the face-shield brackets.
But wait, there's more....this one felt a little light so I did a weight comparicon with this and a much later NP Mk 6 (yes, same size in case you wonder) and it is actually 40g lighter. Now that's hardly anything at all but I did notice it. Another thing I *felt* rather than saw or measured was that the profile of the dome seemed *strangely different* and indeed while weighing this Triton Oliver and having it placed on its head so to speak I noticed that it did not roll around or settle at an angle as do almost all other examples I have tested. This implies (though I cannot prove it) that the top of the shell is very very fractionally flatter than later production helmets. Whether this is an accident or an actual variation resulting from Triton Oliver production practices I do not know. Surely someone out there...perhapos even that Mr Cotton (and sometimes I do wonder whether he actually exists) ...can tell me, us.