Hi. Can’t open the vid on the iPad but I assume that when checking the train without the balance and fork in the wheels when run down experienced a little reverse spin (backlash) if so just install the balance, no fork and give it the puff test. It should oscillate for a while under its own tension quite freely 20 secs or there abouts a thing less like a couple of oscillations check the end shake.
Google translator says:
I received a functional watch, not in very good condition, but the movement is nice and functional Hel.81-26 watch as a gift, the wish came true and the Helvetia is already ticking nicely.
I'm afraid not. I have a Weishi 1900. Even so, I take all TMs with a big grain of salt. You can find plenty of info on WRT by Googling:
site:watchrepairtalk.com Witschi watch expert
The most important thing is that you set the lift angle on your TM to the correct value or the amplitude reading can not be trusted.