![]() ![]() ![]() The first movements used a Germanium PNP transistor, but manufacturers phased this type out quickly so Bulova switched to a Silicon NPN transistor. This 1960 Bulova sheet announced the arrival of the Accutron Because so much of the space is taken up by the battery and tuning fork, Bulova uses an indirect sweep seconds wheel driven by the center wheel. It used a 360 Hz tuning fork (as did all Bulova Accutron movements) with a 300-tooth index wheel. 214, measured 28.7 mm diameter and was 5.5 mm thick. 214 in most models before the end of the decade. Today, it is the most collectible Accutron movement, and one of the most popular movements of the 1960s. Although the first movement, it was incredibly successful with well over 400,000 produced through 1968. It was introduced in 1960, with first commercial sales in 1961. 214 was the first Bulova Accutron movement produced, and the first commercial tuning fork movement. ![]()
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