Model 1 Elgin watch in running condition (but not tested for accuracy).  One of only 33,000 total of this model and grade and one of only 1,000 run quantity.  It's personalized on the back with what looks like MJS.

Manufacturer: Elgin

Manufacturer Location: Elgin, Illinois

Movement Serial Number: 18843878

Grade: 404

Model: 1

Class: 97

Estimated Production Year: 1916

Run Quantity: 1,000

Grade/Model Run: 24 of 26

Grade/Model Total Production: 33,000

Size: 10/0s

Jewels: 15j

Movement Configuration: Openface