This is a replica of a roman military whistle or signal whistle, like the ones my son has found several times while treasure hunting in our region in austria.
They were signal whistles as they were used by the military and by farmers for horse labour until the early 20th century.
This model is optimised for 3d printing and can be printed without support. It is important that a brim is used as the contact area on the print bed is very small.
I suggest a strong printing material like PLA CF!

Have fun printing and leave a like!