Sandcast 3716 / E4692 is listed on eBay. The bike has 16K miles on it and it looks quite nice with lots of Yamiya parts, although I'm not a fan of powder coated frames. It also has a big bore kit and racing camshaft. At first, I thought the numbers were too far off to match, and the seller seems to think so as well. But if you look at the VIN directory, the next couple of VIN numbers (3717 and 3719) are also way off: 3717/E2747 and 3719/E5390 and 3739/E4669. Perhaps they had some odd ball engines lying around that day and decided to put them in.