Section 220
SEC. 220. Ordinary and usual commercial samples, imported by bona fide commercial travelers shall, after examination and identification by the custom-house, upon reexportation within three months after the date of their importation, be entitled to a refund of the duties paid thereon, if upon presentation at the same customhouse, for reexportation said samples shall be positively recognized and identified as being those upon which duty was paid: Provided, That the appraised value of said samples shall not exceed two thousand dollars in any one case: And provided further, That the period of three months allowed for their reexportation ma be extended, in the discretion of the collector of customs, not to exceed three months more, upon application being made to him in writing before the expiration of the original period.