"The ARTS&P system was a licensing system that was used in Australia and New Zealand between 1934 and the 1960s. The system was introduced to verify that radio manufacturers payed royalties for the items they were using that were covered by Patents. Some radio makers avoided this by selling parts, rather than complete radios, even though the parts could be easily assembled into a radio. Each licensed radio was fitted with a small sticker attached to the back of the chassis.

The colour of the sticker is a useful way of determining the age of manufacture.

1934    White, serial number prefixed by the letter A
1935-1936   Pale blue, serial number prefixed by the letter B
1936    Pale blue, serial number prefixed by the letter C
1937    Pale blue, serial number prefixed by the letter D
1938    Pale blue, serial number prefixed by the letter E
1939-1940    Pale blue, serial number prefixed by the letter F
1940-1941    Pale blue, serial number prefixed by the letter G
1942-1946    Pale blue, serial number prefixed by the letter H
1946-1952   Dark Green with red letters, serial number prefixed by the letter  T
1952-1955    Orange with dark green letters, serial number prefixed by the letter T
1955-1960s    Small pale blue, with dark blue letters, no prefix to the serial number."

Text taken by (C) References:

How Old is Your Radio, H.R.S.A. Newsletter, October 1987, P20

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