When the desired fine frequency tuning, in kilohertz (kHz), was needed, the radio operator turned the Abstimmung (tuning) handle on the front/right/top of the receiver until the correct “Teil Strich” number (“graduation mark,” printed in the far-left column on the calibration card) appeared in the fine tuning dial readout window as shown in the next photo.

Photo by Bruce Culp

Photo by permission of www.Horst-Beck-Collection.com