Quote:
N Frame with Canadian(?) "arrow", Crown over 66 over E, and "11" on left side of frame and "crown over BV and crossed pennants on the left front side of the frame.
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That looks like a standard British Broad Arrow to me. The Canadian version has the same mark within a capital C. This column of markings indicates that it was accepted into British military service by inspector number
66 at the Royal Small Arms Factory at
Enfield Lock.
The "11" should be a Roman Numeral 2 (II), indicating that this is the second model S&W approved for British service, the first being the renowned "Triple Lock".
I believe you can still find .45 Auto Rim cases for sale.
I've been looking for one like yours, except converted to .45 Colt. IIRC, the max pressure of the .45 Colt is 14,000 psi.
Edited to add:
Look carefully at the "66" to be sure it isn't "G6". I don't want to look it up right now, but I seem to recall that the inspectors were assigned IDs in the form of "Letter Number".