This is the original Japan first Citizen round calculator watch ever made (model Citizen GN-4W-S 4-096673 TA 49-9135).
This watch produce 1977, all stainless steel and all original, solid link bracelet have full size. All pushers and functions working great including display light.
Watch is in perfect condition. On macro images you can see all tiny details that you cant notice with naked eye.
Great unusual watch like new.