Stainless steel case calculator watch by Juvenia, circa 1950’s with a sliderule and a patented magnifying glass (Réfrascope)
There is a small paint loss at 12 on the sliderule, but it’s not always visible, specially on the wrist, mainly because (or thanks to) the magnifying lens distortions. The rest is breathtaking, the golden arabic numbers and indexes shine depending on the light, the case is unpolished and the glass is beautiful to touch.
36mm without crown.
17 jewel manual winding mvt. working precisely. Revision history unknown.