Accutron Technical Information

For detailed technical information on the workings of all tuning fork movements, including Accutrons and Accuquartz, I strongly recommend you visit Rob Berkavicius’s site by clicking¬†here.

The table below summarizes some of the key facts and figures of these interesting movements:

Series/
Calibre
Dimensions Start of Manufacture Tuning Fork Frequency Index Wheel Teeth Derived Calibres
214 28.7mm x 5.5mm 1960 360 Hz 300 214H, 214HN, 2141, 2142, 2143
218 29.7mm x 4.9mm 1965 360 Hz 320 218D, 2180, 2181, 2181F, 2181G, 2182, 2182F, 2182G, 2183, 2183F, 2183G, 2185, 2186, 218S, 218SC
219 28.75mm x 4.4 1972 360 Hz 320 2191, 2192, 2193
2210 19.4mm x 17.4mm x 4.0mm 1973 440 Hz 270 None
224 29.7mm x 4.9mm 1973 341 1/3 Hz 320 2240, 2241, 2242
230 19.4mm or 23.5mm x 5.2mm 1970 480 Hz 240 2301, 2302, 2303, 2312, 2313
…and for comparison…
ESA 9162/4 29.0mm x 4.8mm ESA 9162: 1969, ESA 9164: 1974 300 Hz 300 ESA 9210
Omega 1220 29.0mm x 5.0mm 1974 720 Hz 180 Omega 1230 (day/date)
Beta 21 (CEH) 30.9mm x 26.5mm 1970 256 Hz 256
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