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.