Look at the manufacturers sticker, it will indicate either a G1 or G2 models.
G1 = 150-170 MHz band
G2 = 136-154 MHz Band
Seems to be a trick in programming these radios, they must be programed in the "SP" mode then it will take the new program frequency. See this thread to read of this adventure - 99-Channel Kenwood TK-730G - The Radio Information Board