This is an antenna coil for tuning germa radio and transistors straight radios.
The inductance is 360 μH, so it is compatible with 260 pF polybaricons.
[Specifications]
Shape: Round; External dimensions: 1.2 x 0.2 inches (30 x 6 mm); Inductance: 360 μH; Reception frequency: 535 KHz - 1605 KHz; Compatible barriers: CBM-113B-1C4.