“Send 5 cents and we will mail you pre-paid, anywhere in the U.S., a 5-cent sack of ‘Bull’ Durham, a Book of cigarette papers, and this 14K gold plated ‘Bull’ Watch Charm, Free….
“We will also send you an illustrated booklet showing how to ‘roll your own’ cigarettes….”
— From a full-page ad in Popular Mechanics magazine (May 1914)
The chain was probably added by an early owner.