I've been chasing a 6139-603X Speedtimer Coke and have been offered this one. I thought I could spot fake dials, but I'm not so sure now. I thought all real dials had a flat top "A" in "Japan", but this one is pointed and the seller claims that only only the early ones had the flat "A". I wouldn't believe him, but it's clear from his Instagram that he's an accomplished collector who owns dozens of top notch vintage Seikos. Thoughts?