King 603 Magneto Coil Condenser Tester - As / Is - Untested

As shown, very clean, appears barely used & well taken care of, in unknown working condition, did a basic test of plugging in & when powered there are no lights & the dial does not move on any setting but if the button on the bottom is pressed when set to coil, mfd or test the unit will sound a buzz alarm, no further testing has been done, sold as/is.