First cover below pays 2 rates UPU (1 oz. @ 5c per 1/2 oz.) plus international registry fee of 8c. Second cover is my personal favorite, franked for same 1 oz. postage and registry plus 3c overpay. The overpayment is hardly surprising -- 5th day of issue mailing date of January 5, 1893 (Argentine, Kans.) must make this one of the earliest six-franking Columbian covers in existence. The sender can be forgiven the enthusiasm over this brand-new phenomenon, the U.S. commemorative stamp series!
I wonder if the ship this envelope would have been carried on out of New York was the first sailing since the Columbian issue was released. The latest NYC registry stamp on reverse is Jan. 9, and there is no receiver mark. Can someone confirm / disconfirm?