This is a precision resistor decade from the Dannisch firm Danbridge. It has three decades. 1 Ohm in 0.1 Ohm steps, 10 Ohm in 1 Ohm steps and 100 Ohm in 10 Ohm steps. It is 0.1%. But it behaves better than that. I measured the biggest difference in the 100 Ohm position. That was only 0.04 Ohm ,.
The inside is made of low tempco wirewound resistors