Shown is a watt hour meter by the Diamond Meter Co., that arrived this morning. It's in very good condition both inside and outside. It's not marked on the meter, but I'm assuming it is a DC type since it has a commutator type rotor. Rated at 100 to 110 volts, 10 amps. All meters made by the Diamond Meter Co. are quite rare. I grabbed this one up as soon as I saw it on the market. It will go next to my Scheeffer Recording Watt Meter.