What is old is new again... flashlights on pistols

Developed and patented by George Seeley in 1912, hence the big S. There were similar designs marketed by other folks, including one that clamped on top of the barrel and had a mercury switch in it so that when the gun was unholstered the light came on. I have old advertisements from Europe that shows candle mounts for revolvers. (courtesy kwill on the Colt Forum)