For this , the tear down will be first , and a short overview on the theory will be later.
**I will add a few more pics as I go through the unit**
After seeing the outside of the unit , lets look at where the output terminals should be.
We are presented with one gold binding post , most likely a Pomona 3770. The other 3 binding post are missing , they look to have been cut from their wires. The binding post sense leads are connected to the source leads by a gold binding post link( judging from other pictures)
The first 3 decades follow the conventional decade resistor layout , except the '1' position on the 10-Ohms range is its lowest setting. The resistor for this represents the difference between 10 Ohms , and the rest of the lower shunted mill-ohm values.
The milliohm range represents a large shift in the expected values in a decade resistor. These occur by shunting a resistor , with varying resistors in series. This will give a range that will increment by a desired amount. This will be explained more later.