http://www.wfmu.org/MACrec/skipsa.html

LITERAL:
This is among a sub-category I call «self-amplified» units. It is playable without any thing else except its own apparatus. This unit required the use of a pencil to provide the spin and a small cardboard horn with which an elastic band helped keep its shape. This provided the amplification through the needle that was attached to it and rode in the groove as the pencil (and hand) of the operator provided the spin. Its a crude sound and I wonder how this was thought to be the proper medium for the Skippy Peanut Butter company to send their message. This is the only product I’ve seen by Sound-O-Gram, the company that manufactured this. It is a simple and effective mechanism for sound reproduction. The audio is not much better live than what you hear in the recording.
About 78 rpm, 195?.