Tektronix 7B71 Delaying Time Base Oscilloscope Module

Description

Tektronix 7B71 Delaying Time Base Plug In for 7000 Series Oscilloscope.
Units came from a working lab that was in business for more than 40 years.
I can't validate if these are working or not so I am selling them as parts. Some units have broken or missing pieces.
Ad is for one unit only. I will pull the unit at random off the shelf. I have multiple units to sell.
Shipping will be well packed.