Mystery object

My father gave me this item some 50 years ago. He was unable to find what it was. Now thanks to a reverse image search on the Internet, I believe I have solved it!
The wooden object has a flared cup at one end of a stem which screws into the slightly concave wheel at the other end and the stem is hollow.

It is, I think , an early monaural stethoscope.

The monaural (i.e. for one ear) stethoscope was invented in 1816 by René Laennec (1781-1826)

In 1816 René Laennec was presented with a female, overweight patient with chest pains. Decorum prevented Laennec from pressing his ear directly to the patient’s chest in order to listen to her heart and lungs. Instead he used several rolled up sheets of paper as a tube to project the sounds. This meant that he could listen to the patient’s chest without making physical contact.
The monaural stethoscope Laennec invented is essentially a modified wooden version of the rolled up paper he first used over two hundred years.

Modern monaural stethoscopes are still used today to listen to the heartbeat of unborn babies through the mother's abdomen.