Hello everyone. I'm trying to collect few informations about the Mimo Loga which was the first wristwatch to has a slide ruler as the Breitling Chronomat in 1941. Except the basic history, alike the patent n. 216202 deposited by Graef & Co in 1940 a month before that one used by Breitling, I can't read nothing about the caliber used on such watch. Neither if it was in a stainless steel case or metal based. The unique information on my questions is from this magazine (https://www.watchtime.com/wp-content/uploads/2013/11/WT_Spotlight_Girard-Perregaux_fin.pdf) and attached below. My intention is to double check the truth because on this article are described the famous Girard Perregaux as the first mass produced wristwatch, which story is still debated and the Mimo-Rex which this is the only image I have ever seen of this rare wristwatch. Ah, yes, also the Loga illustrated is signed Girard Perregaux which I've read about but never seen one.