This pocket mirror is pre the 1940's because there is no area code in the phone number on the case. Area codes were first introduced in the late 1940's.
It is a rectangle mirror in a plastic case with the advertising on the case. The case measures about 2.25" x 3".
The company is Kuntz & Son, Inc., a company which sold coal and fuel oil and was located on 590 Hershey Road in Hummelstown, PA. Phone number was 566-2261 (no area code).
Cute saying on the front "Within the Case is a Familiar Face"
The mirror is in nice condition, considering its age.