I thought I'd add my bike to the database. Got this really nice Sekai 2000 for $90 off of craigslist. Ordered some nos down tube and seat tube stickers from Yellow Jersey. I'll just be doing a light rebuild of this one because it's in such nice shape. S/N is Y0F9054 so based on what I've read that puts it at about 1980. Suntour GT derailleur has a date code of WA so that puts them at about January 1980. The bike has a sticker form the original Velocipede bike shop that sold these bikes in Seattle.