The title of a bona fide purchaser of real estate, without notice and for valuable consideration, from the devisee or devisees of a testator, a will of whom has been duly admitted to probate devising such real estate, shall not be affected or impaired by any devise or other disposition of any such real estate by the testator by or in any other will or wills executed by him subsequent to the instrument already admitted to probate as his last will and testament, unless any such subsequently executed will (or if any such will has been probated without the state, an authenticated copy thereof) shall be filed for probate in the court having jurisdiction for that purpose, or with the clerk thereof, within one year next after the testator's death and shall afterwards be admitted to probate as the will of such real estate and entered of record in the proper clerk's office: Provided, however, That if any devisee under any such subsequently executed will is at the time of the testator's death an infant, or insane, or a convict, the limitation created by this section shall not affect the rights of any such infant, insane person or convict until after the expiration of one year from the removal of such disability.