Despite its (very) small size, the BVL
link 100 manages to cram a 170mm long mainspring into a 5mm diameter barrel, with a 30-hour power reserve. The watch has a lever escapement
seiko sarb033 nuovo but with an unusual (nowadays) side-lever configuration, as opposed to the almost ubiquitous in-line lever design in which the axis of the
link lever is more or less on a line drawn between the balance pivots and the escape wheel pivots.