This unit is a Hewlett Parckard 909D (f) Termination.
Specifications:
-DC 26.5 GHz
-Option 011: 3.5mm (f)
This termination appears to be to a model 909D as shown in photo the type has worn off.
***MPN 909D
***OEM Hewlett Packard ( HP ) / Agilent
***SKU*** 37544



