The MIDO Berencelli series M8607.4.M1.1 mechanical men's watch (see the picture below) uses Valjoux? 7751 (ETA7751) as the basic movement, which has been re-improved and polished. Mido1321 self-winding chronograph movement, the domestic official unified sales price is 19,800 yuan.

The Longines Master Series L2.673.4.78.6 mechanical men's watch (see the picture below) uses the Valjoux? 7751 (ETA7751) as the basic movement and the re-improved and polished L678 automatic winding watch. The official domestic sales price of the chronograph movement is 25,400 yuan.

The basic movements used by these two watches are the same, both are re-polished Valjoux? 7751 (renamed ETA7751 after the acquisition) automatic winding chronograph movement, and the 7751 movement is ETA Known as one of the three classic movements, the 7750 movement is an upgraded version that adds calendar, weekly calendar, monthly calendar and moon phase display functions. Its quality is naturally very excellent. As for the craftsmanship quality and durability of finished watches using this movement, it can only be said that the craftsmanship standards of various brand watch factories that use this movement and then polish it lead to different quality consequences.

In terms of polishing the movements of these two watches, Mido has made slightly more changes, using INCABLOC?and?NIVACOURBE shock absorbers, replacing gold-plated nickel balance wheels, NIVAROX?II? Hairspring, NIVAFLEXNO mainspring, and the movement was modified to add blue screws, rounded gums and Geneva ripples. All the changes are commendable, and more importantly, they do not affect the original quality and performance. The polishing of the movement of this Longines watch seems to be more about precision adjustment than material selection, so there is not much to say. It may also be related to the product process requirements of Longines. This L678 movement cannot be said to be successful when used in Longines watches. The actual performance on the market has already illustrated the problem. The L678 movement has become the highest repair rate of Longines watches. One of the highest movements.

To sum up, I personally do not recommend choosing Longines’ watches with complex chronograph functions. The prices of watches with the same movement are so different, and the price-performance ratio is really too low. Even though the market positioning of Swatch's brands is slightly higher than that of Mido, the quality of Longines is really disappointing and does not match the quality of its craftsmanship.

I hope the answer will be helpful to you.