The object is a large metal circuit carier with a phenolic board mounted underneath. It has 10 vacuum tube sockets, 4 are populated. Various BNC jacks and two multiconductor connectors are mounted on the top. There are two pairs of indicator lights on the bottom. The labeling of these indicators and many of the BNC connectors suggest that this register has two flip-flops, identified as "A" and "B".
Printed in white on both the top and bottom of the object