The original model of the Wii system (RVL-001) is the first revision of the Wii released. It comes in two colors, white is the original color, and black was released later in the Wii's lifespan (2010).
There is zero way to visually tell the difference between a Wii supporting DVD playback vs a Wii with a new drive, only supporting Wii Optical Discs and GameCube discs, apart from black color Wiis, which almost always have a Wii Optical Disc and GameCube disc drive.
boot1 signing bug
GameCube backwards compatibility
Almost all up to date RVL-001s have boot2v4 installed. Certain late models may have boot2v5 installed, but boot2v5 RVL-001s cannot be confirmed, apart from certain new models sold in the UAE.