This is a very rare find in this size!  This is an old, antique Lonergan, Phil. Penn.  brass three chime steam whistle, complete with valve.  This whistle is overall 8 1/4" inches tall and is 2" inches in diameter.  It weighs a little over 2 1/2 pounds.  It has a 1/2-inch threaded inlet.  It is marked PHILA. Lonergan PENNA. Small ones such as this one are highly desirable among collectors and live steam locomotive enthusiasts.  

This whistle is overall in excellent condition.  As seen in the pictures I have NOT taken this one apart as to NOT disrupt the nice natural patina, but everything appears to be in working and usable condition. As expected with anything this old and fragile there are a couple of small imperfections (see photos) but nothing that takes away from its beauty and operation.

The wooden stand is NOT included it is just to hold the item for pictures! 

I did connect to air and it does HOOT! as it should.