This is a new-in-box Sangamo Milliammeter. 458N0710. Weston Model 506 D.C. Milliammeter. Range 200 Milliamperes E.D. C=Black Dial with red block from 80 to 90 and from 170 to 180 and with marking "Voice" and "CW" in white. Sangamo Electric Company Springfield, ILL. Made in USA. 1806 11-43 21M 69541. It is in Penryn. Call show contact info
to see it/buy it.