I think it's a Bang Mellow Yellow. If you look at the rear of the sole design it's more squared than a TaylorMade. Also, the loft designation is in exactly the same place and the Mellow Yellow is 420 cc's.
Not only that, look at the paint job on the crown. The part toward the face is recessed (trying to reduce sky marks), a characteristic of a Bang clubs ( I have a Bang-o-Matic 401 GS) THats what tipped me off.