I have a flare pistol like the two shown in the accompanying
photos. It is roughly finished and has the following marks
(all on the left side): "M601" neatly stamped on the hammer,
the 6-digit serial number crudely stamped on the chamber,
and the broad arrow stamped on the frame. There are no proof
or inspectors' marks. The grips are plastic. I assume it is
WWII vintage.

I found the photos in an ad on the Web. The dealer referred to
pistol 1 as a "No.1 Mk.5 M" and pistol 2 as a "No.2 Mk.5," although
they appear identical.

Attachment 27232Attachment 27233

Can someone tell me the proper designation for my pistol?
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