Elgin pocket watch, open face, grade 303 size 12, slim movement (1922).

This is a great pocket watch.  It slips into your pocket easily and you do not know that it is there.

I purchased this one broken at an antique store for about $20.  It had to be cleaned, lubricated, and adjusted.

Below are photos of the watch movement throughout the disassembly, cleaning, and reassembly for reference: