Don't agree that you could only classify it as "French" - it was a common European design. I for one am happy to assist with research - thats part of the hobby - joining in the fun of discovery!
Here is a description from the British Portable Antiquities Scheme database for a similar find in England: Unique ID: BH-A0DDB1
A pewter hawking whistle of post-medieval (probably 18th century) date. The object is intact and in good condition. The body is cylindrical, tapering slightly towards the bottom. A raised ring at the top separates the body section from the thinner mouth-piece. Immediately below this upper ring is the semi-circular aperture which allows the sound to escape. A second ring is located towards the bottom of the body. Fitted to the underside is an attached suspension loop consisting of a tapering cone surmounted by a perforated globe. The whistle measures 43.85mm long, 14.6mm wide and weighs 12.9g. Class: Hawking