This National HRO-50 Dial Scale for B Band, is Part Number P136-2.�This one is in excellent condition.�This Dial Scale will also work in the HRO-60 Receivers. The only difference is the dial scales for the HRO-50 receiver are concave with the curve of the dial drum. The dial scales for the HRO-60 Receivers are flat with beveled edges.�Each will fit on the dial drum and will fit together even if they are mixed.�This dial scale is required for the associated letter coil