
The Sinn 1739 St I 4N F.A.Z. (ref. 1739 St I 4N F.A.Z.) is an automatic tool watch, with a 39mm stainless steel case, 9.1mm thick, powered by the SW300-1 movement and a 42-hour power reserve. Water resistance is rated to 100m, under a sapphire crystal. Manufacturer MSRP is $2,430. The dial color is blue.
Owners widely praise the Sinn 1739 St I 4N F.A.Z. for its dressy and classy aesthetic, highlighting its high-level lacquer dial and polishing. The watch is noted for its clean dial, enhanced by the absence of a seconds hand and date window. Some owners find the case surprisingly chunky for a dress watch, despite its stated thinness. On balance, owners rate the Sinn 1739 St I 4N F.A.Z. highly for its elegant appearance and refined finishing, which distinguishes it within the brand's tool-watch reputation.