IMO these watches are built, and as accurate as the best out there.The only thing they lack is the image,a bit like Lexus ver Mercedes.But I have been looking for a early 60s model at the right price to add to my collection.The 430 Grand Seiko,is the one I am looking for,beautiful movement and very accurate 1-3secs a day easily acheavable.And in the early 60s there were only two companies, who could sell watches, passed astronomical observatory authorization Chronometer in those days. ---Seiko and Giraud Peregaux.
http://www32.ocn.ne.jp/~kseiya/gs/