Production of the new telephone commenced in 1965 by STC, and an initial quantity of 1000 was offered to customers on a selective trial basis in the London North West Telephone Area in the same year. It became available throughout the country in 1968, at extra rental cost, with a choice of three two-tone colour schemes: grey-white, grey-green and two-tone blue.
In 1965, STC began producing the new telephone, with an initial trial release of 1000 units in the London North West Telephone Area. By 1968, this model was made available nationwide at a higher cost, featuring three two-tone color schemes: grey-white, grey-green, and two-tone blue.