10c violet 'Momotombo' TRAIN postal stationery envelope with large '1907' handstamp in violet (H&G B69a) used with added 1906 15c on 1c green and 1907 10c on 2c rose carmine PROVISIONAL 'Surcharge' issues (SG 226B & 246A) tied by two fine strikes of oval LEON cancels dated SEP 17 1907 with straight line 'BUZON URBANO' marking in purple alongside. Addressed to USA with CORINTO transit mark on reverse. Fine & scarce.