Fortunately, and again thanks to the boards and members, I have learnt a lot about wrong movement descriptions. That made me buying Swiss ETA, so called Asian ETA 2813 or the Seagull ST-19 knowing exactly what I was doing.
In this case, we speak of the well known 7750, with a modification that does not exist.
Well, not a big issue actually, if I had bought the watch, I would anyway have gone for the Asian 21J version, which is pretty close, if you exclude the lighter AR coating and obviously cheaper strap.