Yep, the dial guilloche on the Tonda line is performed manually on a straight line engraving engine. It is not CNC machined.
By: M4 : August 9th, 2025-18:00
Partly in response to questions raised on this forum, PF posted a video on Instagram showing the guilloche process. It was included in this post I made in June> www.watchprosite.com Thanks for the follow-up K-Lo!