Here is a Jewell AC voltmeter.
The scale reads 0 - 30 VAC.
There are scale marks of P, M, G and E and is to be used to check magneto voltage.
I believe these stand for Poor, Medium, Good and Excellent.
The meter is on it's original box (the serial number on the box is the same as the meter).
It looks to be NOS as there are no signs of being used.
$100 plus shipping.
bcascisa at gmail.com