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the Royal family
In the early 1930's
Breguet coil over hairspring
They are a pleasing blue suggested best in the photos of the case back and winding crown
1972 Longines Admiral HF Munich Olympic Edition Large Vintage Mens High-Beat Watch - Stainless Steel 18K Rose Gold the Royal familyDuring the late 1960s and early 1970s, watchmakers were engaged in a technological race to improve the accuracy of mechanical wristwatches. One of the most important approaches was the development of high frequency movements balances that oscillated faster than traditional calibers in order to deliver improved stability and precision. Longines was one of the companies at the forefront of this effort. Models marked HF (High Frequency) represented the
