A quality French dynamometer by Cheron and Verdin of Paris from the turn of the century and shown in the Boulitte, 1913 catalogue.
The instrument is made from plated and unplated steel, blued steel and brass. It comes in the original velvet lined fitted case. Squeezing the instrument in the palm of the hand moved the needle and the applied force can be read on the brass scale. There is a reset button at the top of the scale which returns the instrument to the zero setting.