Labeled M-17, is that correct? 1k/2k cannelures.
One of these is not like the others.
The two cartridges with the headstamps " .50 K " I believe are export rounds, see:
@bdgreen in particular I’m looking at the one on the left with the soviet 12.7 style primer.
All three are late M17K tracer loads made by Eley Ltd. Can you show pictures of the stencilled case markings?
Can you give me an example of what you are asking for? Picture above shows the primer that I’m looking at.
I don’t know the details about the example with the large primer, but it is reported to be a 1984 contract for Norway.
Many examples of this late Eley production have stencilled markings on the side of the case (lot, date, purpose, model, &c.).