If you engage with Grand Seiko collectors in a meaningful way on the internet and social media, you?ve almost certainly been part of a conversation that relates to watch thickness. Grand Seiko watches, as beautiful as they are, and as much as many of us love them, have always had some heft to them. At least, they measure that way. A large part of the discourse on forums and such is ?But they wear thinner!? And they do, thanks in large part to the unique geometry of many Grand Seiko cases. The thickness on these watches is often disguised behind generous Zaratsu polish, and even transformed into an attribute if you?re into admiring expansive and expertly finished bevels. Still, there?s no doubt that the trend in the watch industry, particularly among vertically integrated brands that have know-how, is to make watches thinner, and more wearable, with the help of new movements that allow for more svelte dimensions. Grand Seiko has been moving in this very direction with an assist from the 9SA5 movement, a high frequency caliber found in the White Birch that Zach W. reviewed just last week. But what if Spring Drive is more your thing" Grand Seiko?s next generation 9RA5 Spring Drive caliber was introduced last year in a limited edition dive watch that was anything but thin, which has led enthusiasts to wonder when an automatic, Spring Drive equipped watch would take center stage. Well, with the new SLGA007 that Grand Seiko has just unveiled, that time has (almost) come.Â...