Push pedal bell ??

[John Dayhuff]

I looked at a 1930 Huckster the other day and on the passenger's side floor board just in front of the seat there was a small push pedal sticking up out of the floor board, just in front of the seat. It was about the same size as the gas pedal and I had no idea what it was until I gave it a good push with my hand and it struck a bell that is mounted under the car. Pretty loud too.
Was this an accessory from back in the day or do you think it was something somebody just rigged up on there own? I thought it was pretty cool and would like to do something like that on my Phaeton.