Stamped in white ink on the bottom of the insertion key.
Printed in silver ink on the phenolic base.
overall: 3 1/8 in x 1 1/2 in x 1 1/2 in
This tube is a digital counter enclosed with a glass envelope with a 12-pin phenolic base. The counter is advanced by electrostatic deflection. This created a narrow electron beam that moved through a small aperture in the target electrode and strikes a green phosphor target on the glass envelope. The target had the numerals "0" through "9," giving an indication of the current count. This object is enclosed in the original box, which is in fair shape and included with the artifact.