New (never installed) Shallco 320Q-2B3 600/600 ohm rotary attenuator w/cue
This attenuator has never been installed so its like new even though its probably at least 30 years old.
Vintage Shallco 2T 256G dual-gang 600/500 ohm 20 step/2db rotary attenuator
Vintage Shallco 2T 256G dual-gang 600/500 ohm 20 step/2db rotary attenuator as shown