Hi Tibi,
congratulations for Your excellent channel, started by a person that really knows what's inside a vintage digital watch (I've remembered that You are the only one person I heard about - and I've read it on other forums - that was able to repair the wireless transmission coil on a Seiko Data 2000/UC 2000 watch!). And I've seen that watch also present on Your channel!
https://www.youtube.com/watch?v=bc4aI9h--NU
Also the above mentioned movie confirmed me that the Seiko Data 2000 and Seiko UC 2000 Wrist Computer are basically the same watch, marketed different by Seiko in early 1980! (since they both may use the Seiko's UC 2200 most advanced wireless controller without any problems!)
Congratulations again for Your excellent Youtube channel, dedicated to vintage digital watches and keep up the good work.
Best regards,