Grand Seiko Heritage Collection "Soko" Auto Steel Mens Bracelet Watch SBGA429. Pre-Owned Grand Seiko Heritage Collection Spring Drive "Soko" (SBGA429) self - winding automatic watch, features a 39mm stainless steel case surrounding a gray dial on a stainless steel bracelet with folding buckle. Functions include hours, minutes, seconds, date and power reserve indicator. This watch comes complete with the original box and papers. WatchBox is the global destination for luxury pre-owned timepieces, offering an expertly curated inventory of luxury pre-owned watches for sale, personalized ...