This is different with all wheel brands but some may have an embossed stamp of the brand or a sticker on the inside of the wheel listing the brand, its size etc.
I've found that most Japanese wheels (Enkei, Work etc.) are affixed with a sticker inside the wheel whereas European wheels (OZ Racing, BBS etc) have their logos and specs embossed on to the actual wheel. This is just a big generalisation though - you will see the opposite occurring with other brands.
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