John,
I have not come to agreement with you on the subject of Israeli Mills' copies. I quoted a book reference found via Google, only because the relevant text was almost verbatim to what you had written earlier in the thread,
http://www.bocn.co.uk/vbforum/threads/76071-Mills-grenade/page3?highlight=israeli+mills
which - in the absence of any other forthcoming documentary support from you - appeared to form your evidence.
No one has, so far as I understand, produced any evidence for 44 on the base plug being the date 1944, when you contend that "Irgun actually declared war on The British Government in
1944. It is probably that fact that is commemorated on the baseplugs of the grenades". I attach a photo, albeit from a mediocre phone camera, of an Israeli base plug marked 43. No doubt there is an explanation of this as being 1943.
You say you doubt the Israeli variant as being termed a No.4, and that you have never seen any official documentation, but that, along with photographs of early improvised Israeli grenades, has now been kindly provided by other members (previous posts).
Whether the 43 or 44 represents a 40's date, 50's, 80's or some totally different mark may not be solved to the satisfaction of all or any party.
Tom.