So I decided to follow beanflying footsteps and enter the rabbit hole of volt-nuttery.
I was shopping for a Kelvin-Varley voltage divider and found a whole set for less than what I was going to pay for the divider alone.
I scored:
1 x ESI RV722 Kelvin-Varley voltage divider
2 x ESI DT72A Standard Decade Transformer (AC divider)
1 x ESI 240 Kelvin Ratio Bridge
1 x ESI RA79 Quadrature voltage generator
Look like everything was last serviced in 2010 and I even got the deviation for the RV722.
(If there is some interest I could take some naked shots and post them later … mostly going to be bunch of old resistors and transformers
)