Eley-Kynoch headstamps


Hello Everybody,

I was looking at some eley cases and noticed some difference in the headstamps.
The headstamps shown are all different in the way of starting and ending the Eley - Kynoch.
Has this perhaps got something to do with a timeline??
I think the one at the bottom is an australian one.

Also the ICI shown some difference.

Any help / ideas are welcome

regards rené