Sinn watch 240 st vintage leather traditional styles based on a classic design the sinn 240 st model has been fitted with an exquisite oldie world style strap to complete a truly vintage inspired look culminating elegance with a professional air of clarity the sinn 240 finished on a stunning bead blasted stainless steel protective case echoes the brands strive for excellence and boldness stamped with the brands distinguishable attributes of workmanship throughout its design and blueprint