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Your radio is a nice acquisition. Thank you for the pictures.
Your radio covers the short wave frequency range of about 4.5 million cycles per second to about 16 million cycles per second. Currently the term used for cycles per second is Hertz, named for Heinrich Hertz. This started around 1930 and became more formalized around 1960.
On your radio the "M" stands for million and the "c" stands for cycles per second. Today it would be M for million and Hz for cycles per second.
Your radio covers, in general, the shortwave bands from 49 meters to 16 meters. Back in the day and still today, shortwave bands (ranges of frequencies) may be referred to by there generic wavelength.
With in the frequency range above along with commercial broadcast stations, there were aeronautical, maritime, military, time and frequency standard stations and commercial communications point to point both fixed and mobile stations.
And then there were the ubiquitous and mysterious so called numbers stations that just broadcast stings of numbers.
Ah, the good old days of shortwave radio.
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