That broad arrow is like nothing I have ever seen before. It does not appear to be either official or factory. Maybe someone got carried away with a Dremel tool. I believe the N is an inspectors mark; I don't know the exact meaning of the letter.
The Mk VI was adopted in 1915, with serial numbers starting where the Mk V left off, at 193026, which would make yours an early one. If the cylinder has not been cut for use of the .45 ACP with half-moon clips, it is fairly valuable even with the odd marking.
If the cylinder has been cut, please do not fire it with standard .45 ACP loads; the cylinders have been known to burst from the much higher pressure of the .45 ACP.
Jim
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