....Factory letters would be helpful for those E11 guns that link them to Canada shipments.....
I think the 'E' is part of the Enfield Arsenal Inspectors View Mark.
E for Enfield
Crown/#/E
The 'II' stands alone and signifys the Model or 'Mark' of the revolver.
(The # is one assigned to a specific employee/inspector at the Facility.
I'm not aware of any records that'll tie names with the numbers in any era,,but you never know..
So, I would hazzard a guess that a Crown/# would be an English (or Commonwealth?) arms inspector applied mark BUT not done within one of the Royal Arsenal facilitys like Enfield, BSA, LSA, ect.
Maybe one of the Arsenal inspectors assigned right to a factory like S&W, Savage (Lewis Guns).
Or a Canadian small arms inspector doing his/her job and marking the revolvers as they arrive in Canada.
(Seems like the Canadian Ross rifle of WW1 issue was stamped with the Crown/30 (Final?) inspection mark also and was applied at the Quebec Arsenal.
Might be wrong but that's what I seem to recall from my somewhat loose knowledge of the military Ross rifles.)
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That Crown/II mark on the butt of the revolver in the pic posted by acco40
looks more like a view/acceptance mark of the Model (Mark II) than for a an Inspector #2.
Awfully fancy 'II' for a simple inspectors stamp.
(Beautiful Revolver too BTW!)
IIRC the commonly seen '30' on the Canadian MkII's is just a block figure stamp number. No fancy numerals there.
...Those British guys,,,I think they got a new and different set of number and letter stamps every Christmas.