21 Jewels
Pictured: Burlington Watch Company Advertisements, The Courier-Journal, September 10, 1916 (19 Jewels) and October 8, 1916 (21 Jewels). In October 1916, the Burlington Watch Company upgraded its 19-Jewel product line.
Elgin Grade 91 movement behind the dial featured in yesterday’s post. While factory records list a single run of 1,000 serial numbers designated for the Grade 91, it is estimated.