The picture shows a view of this Old Boston Traveler Doll Club Advertising Celluloid Pin Back Button. The pinback button is not dated but it is old. It is not marked and the manufacturer is unknown. The button is imprinted in blue on a white background. It has an image of a doll with a ribbon in her hair. There is a union stamping on the tin back. It is marked as follows:
BOSTON TRAVELER DOLL CLUB
The advertising pin back button measures 7/8'' wide. It appears to be in near mint condition as pictured.