Sinn watch 6100 technik cowhide with alligator enbossing the 6100 regulateur technik is probably the most modern looking watch from the classic timepieces series it comes with sinns sz 04 hand wound calibre that performs 18 800 vibrations per hour and has 17 bearing jewels the black dial is electroplated and uv resistant additional features include appliques attached by hand minute scale on the inner ring high and low pressure resistance luminous dial elements transparent case back and