This is a prototype of the 15" Sonic Boom plush that was later released by TOMY. I am 100% certain that this is a prototype as it looks identical too another Boom Sonic that is confirmed to be a sample and uses the exact same designs and has the same features, the facial pattern is also 1/1 to TOMY's and I do not believe any bootleg or custom would ever be able to come close to replicating it as well as on this plush. Plush did not seem to have any tush tags attached on him as I cannot find any trace of one. This plush originated from someone who randomly acquired it and resold it and did no research on the item and assumed it was some ordinary Sonic plush, it is very very likely they found it in a goodwill or something as there has been a history of  one of a kind prototypes ending up in thrift stores by past employees. This is an absolute must have for any sonic fan or anyone that was a fan of the TOMY Line and you will never find another. Please see photos for best details.