It depends. If it is a "J1" watch, it's "Made In Japan" as defined by the JWCA.I re-read your post. So the 7S26 could be made in Japan. The amount of manual labour in one of those is minimal or nil. The lower level Seiko watches are not assembled in Japan, and the parts are not produced in japan (apart from possiblty the moveemnts). So IMO they are not Made In Japan watches.
Look at SNZG11J1 vs SNZG11K1. They are the same one, but one is "Made In Japan" and the other is not. It's really easy to tell which Seiko's are made in Japan and which ones are not. I have never seen a J1 watch not "Made In Japan".