Section 141A. Whoever, with the intent to misrepresent to a prospective or eventual purchaser the number of miles traveled by a motor vehicle, turns back or readjusts the speedometer or odometer thereof shall be punished by a fine of not less than five hundred nor more than one thousand dollars, or by imprisonment in a jail or house of correction for not less than thirty days nor more than two years, or both. In a prosecution under this section, evidence that a dealer, as defined in section one of chapter ninety, or a person required to be licensed under the provisions of section fifty-nine of chapter one hundred and forty, by himself or by another turned back or readjusted the speedometer or odometer shall constitute prima facie evidence of such intent to misrepresent.