1960's Seiko Mono Pusher Chronograph 5717-8990

The Seiko Mono Pusher Chronograph is a special piece of the Seiko legacy. Designed alongside the Seiko World Time, both were created to celebrate and assist in the 1964 summer Olympics that would be hosted in Japan, also known as the 'Games of the XVIII Olympiad'. This specific chronograph hosts a 60-second timer and the pusher can be used to start, stop, and reset the chronograph feature. The ref. 5717-8990 also features a date wheel, which was not present in the first 45899 Mono Pusher model. 

Reference: 5717-8990

Circa: 1960's

Bracelet: Aftermarket stainless steel bracelet

Case Size: 38mm x 44.5mm Lug to Lug

Lug Width: 19mm

Case Metal: Stainless Steel

Functions: Hours, Minutes, Seconds, GMT, Date

Box and Papers: No box or papers - watch only

Crystal: Acrylic

Bracelet size: 7.25”

Movement: 5717 - Manual - Serviced 07/01/25

Case has light micro wear throughout. Bracelet has stretch and moderate wear. Dial has no wear. Crystal is new. Serviced 07/01/25.

Grand Seiko emerged in 1960 as a high-end watch line from Seiko, aiming to challenge Swiss dominance in luxury watchmaking. The brand quickly established itself with Japan's first chronometer-grade watch and later gained renown for its innovative Spring Drive technology, which combines the best of automatic and quartz movements. In 2017, Grand Seiko became an independent entity, solidifying its position in the luxury watch market.

The brand's design philosophy, known as the "Grammar of Design," was established in 1967 with the Grand Seiko 44GS. This aesthetic approach emphasizes legibility, refined appearances, and distinctive features like multi-faceted markers and hands, a half-recessed crown, and the meticulous Zaratsu polishing technique. Grand Seiko continues to push boundaries in watchmaking, as evidenced by recent innovations like the "Kodo Constant-Force Tourbillon," while maintaining its commitment to precision engineering and unique design language.