The new additions go on an "Urban Safari."
The watches are inspired by their highly sought-after 62MAS from the 60s.
The watch is a modern update to the Seiko 6105.
The final run will be limited to 300 watches.
The four new models just hit the Hodinkee shop.
The solar-powered battery can keep the watch charged for six months.
The first Prospex store will open in Tokyo's Ginza shopping district.
The watches will be exclusive to Beams, Freemans Sporting Club, Journal Standard, and United Arrows in Japan.