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 | |