
The Sinn 103 St (ref. 103 St) is an automatic tool watch, with a 41mm stainless steel case, 15.5mm thick, powered by the Concepto C99001 movement and a 48-hour power reserve. Water resistance is rated to 200m, under a acrylic crystal, with date, day-date, chronograph, pilot's bezel complications. Manufacturer MSRP is $2,538.
The Sinn 103 St is widely praised for its classic chronograph appeal and purposeful 41mm size, with owners finding the Ty Hd variant stunning in person. Reviewers highlight its domed acrylic crystal and consider the model an outstanding value for the money. Some owners note the 103 St Sa E's 17mm thickness may be an issue, despite its wearable case dimensions. The Sinn 103 St is also recognized as a space-capable watch, having been worn on a MIR mission. Overall, owners and reviewers rate the Sinn 103 St highly for its classic chronograph design and strong value proposition.