1872, 6 Sk. Posthorn reddish brown on correctly franked letter from single circle postmark "mountains 25 1 1876" to Santander / Spain, issue typical perforated, interesting double tooth lower right, in perfect condition, folded letter twice vertical folded and with complete content, for Norway extreme scarce destination, hitherto only 2 documents to Spain known, detailed photo expertize Witschi SBPV "the stamp and the stamp are genuine and with the folded envelope allied. It is a clean received, interesting Postal service record from the early stamps time Norway. "