(Catalogue picture from 1980)
1979 when the quartz crisis was in full bloom SEIKO released the 9983 movement, a HAQ (high accuracy quartz) with double quartz crystals and thermo compensation. Specs are +-5 seconds/year and this model cost about 3 times as much as a Rolex Submariner the same year. +-5 spy is still 2016 the best spec available for a quartz watch.
The 9983-8000 is one of the two original models released 1979 and it is of course very rare to find today .
The integrated bracelet and the coarse surface makes it a real stunner imho. The all applied markings of the dial look great and the dial structure resembles paper.