Like vitreous enamel, urushi lacquer has unparalleled longevity, being impervious to almost anything except ultraviolet rays from sunlight that will cause fading.

Fully featured in-house movement The movement inside is the calibre 8R48, which is visible through the display back.

The dials are painted by hand, left to dry and then polished, with each step repeated to achieve the smooth, inky finish.

All the numerals and markings are made of silver powder, with the fine grains of the metal powder visible up close.

The 7000 series was a family of mid-range mechanical watch movements from Seiko from the 1970's through the 1990's.

Produced from 1973, the 7000 family was a midrange mechanical offering.