I,m still using the original clock that I purchased in 1958 for 25 pounds. A lot of money in those days, for a young kid with a paper round etc, as I was back then. It is an STB & it has been a beauty (very reliable) for me. So any 2nd hand STB by my experience, could be worth the investment. For those that do not wish to spend the money required, to purchase a new clock at today's prices etc.