Elgin Grade 152

The Elgin grade 152 isn't found quite so often.  It is a 16 size movement, with with 15 jewels.

This is an older model, none were made after 1900.  This example was made about 1898.

It features a micro-regulator and gold jewel bezels.  This open-faced case is threaded in the front, and hinged, with a dust cover, in the back.