A majority of these main stream "Swiss watches" are simply a packaging exercise. Please have a look at the definition on a Valjoux 7750 movement and you will see what you might think you have bought was actually made by the famous (and sometimes gawdy?) Swatch company.
I recall that TAG Heuer was bought by Trading Avant Gard (TAG) when the Heuer company was about to go tits up and I once heard that Manser Ojeh paid a paupers sum for it ( I worked in McLaren International on the F1 team for three years and got to know some of these people). Apparently quite a lot of the Early TAG's had Seiko movements !!