I have just taken possession of this 1914 EKII with a closed four. This one has me scratching my head at the moment. I'm pretty sure that it is an unmarked KO without the hump for the jump ring.
I have another in my collection that is very similar if not a match.
Love to hear any thoughts on this one.
These are some older pictures I have of my other closed 4 without a MM or the hump for the jump ring
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