W is 900 MHz. However, Motorola didn't start using this scheme until sometime in the 90's. Before then, the band was indicated by the 3rd character and it was a number. E.g. 3 was VHF, 4 was UHF, 5 was 800 and 7 was 900, etc. The most irritating thing about the old radios though was that you couldn't tell a specific range, just whether it was high band, UHF, whatever.