You are making good progress!

www.RadioDaze has an excellent chart for component codes. I keep a copy on my bench within reach.

http://www.radiodaze.com/vintage-component-color-code/From the chart, this would be a 250pF, 500V, 20% capacitor.

You could find the coil Inductance via

1. Disconnect one end and measure with LCR Meter

2. Count turns, measure coil inside diameter, measure wire AWG, use an online calculator or chart from old Handbook.

Engineer Method:

Use the parallel and series LC formulas to confirm the installed resonance, then plug in values for the installed coil; Desired Frequency to solve for required capacitor.

Technician Method

Alternatively, hook up a variable capacitor in place of original capacitor. Using dip meter, adjust variable cap until you reach desired frequency resonance. Use LCR meter to measure value of variable capacitor. Install new cap of nearest value. Adjust slug of inductor for peak.

bill