Mass. Gen. Laws ch. 90, § 1D: Motorized bicycles; sales; number sticker or plate

Section 1D. Any person who is engaged in the business of buying or selling bicycles or motorized bicycles shall, upon the sale of such motorized bicycle, affix a sticker or plate which shall bear a distinctive number, as prescribed by the registrar, to said bicycle upon a fee to be determined annually by the commissioner of administration under the provision of section three B of chapter seven. Said fee shall be forwarded to the registry of motor vehicles by such person. Said sticker shall be renewed biannually in the manner prescribed by the registrar.