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In the early days of radio, the "location" of each station in the radio spectrum was not determined by frequency like it is today, but by wavelength. So, this radio was built during the transition period of measuring by frequency only, and it has both frequency and wavelength.
Wavelength is still used today to name different bands, such as the 49 meter international shortwave broadcasting band, and the 80 meter amateur (Ham) band.
Wavelength = 300/Frequency (in MHz)
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