Arm and Hammer Soda brand advertising dip pen

Black hard rubber case resembling a large dropper filled pen. Hollow sealed glass tube with glass dip nib end, containing an ad for Arm & Hammer Soda. The glass slides right out and is too loose to use while still inside the case. The arrangement seems to be intended as a hard rubber case to protect a glass dip pen. The paper was found wadded up deep inside the case.