Stunning Longines Heritage 1954 Valjoux 7750 movement, it is clearly a mechanical, automatic chronograph, to be precise calibre L674, the balance wheel oscillates at 28,800 vph and the power reserve is 46 hours. In addition it has 25 jewels. The watch has scratch resistant sapphire crystal, treated with anti glare coating on the bottom part. Watch width: 40 mm. The push buttons are rectangular and imperceptibly rounded off to be more pleasant to the touch, but with an almost angular appearance. From the Heritage Collection, model, L2.747.4, assigned to commemorate the glory of the brand. It is truly a complete chronograph in all aspects. Purchased on 20/12/2017, not quite 3 years old and worn 3 times. This is a numbered edition model.