Spherical whistles is a term I use for various whistles , Globular shaped Balloon shaped and others which were not in use in Marine vessels or as Swiss and French railway whistles , Known as short Buson type whistles , but for Hawking, Bird calls , and Bicycle whistles , It is also known as Short Buson or Swiss Railway whistle. there is a large variety of French made toy and military whistles which were made in France when Flying Balloons were popular, although they do have a spherical sound chamber the mouthpiece is note a pipe (See last photos samples of round whistles with spherical sound chamber). The term Globular whistle appears on old catalogs.
The above Hawking whistle was made in Switzerland c 17th, 18th Century ,
It has a the look and feel of a Copper and Bronze mixture I did not see before.