Hi Martyn,
It really is difficult to tell from your picture.
Below are some images of "Lambourne" shanks (sliders) and as you have may have already noted, the stampings are (as with the badges themselves) haphazard at best. As long as it doesn't match the last image, I think you are OK with this badge.
All the best,
Andrew
Last edited by Nozzer; 10-02-18 at 10:25 PM.
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