Panama, 1888, Registration stamp, 10c black on gray (Scott F1), used with Panama 10c black on yellow First Map Issue (Scott 11), tied by "Colon 16 ABR 1891" duplex on cover to Vitrey-s-Mance, Haute Saone, France (backstamps); cover with some edge wear otherwise Very Fine. ONE OUT OF FOUR RECORDED USAGES OF THE NEW PANAMA F1 REGISTRY LABEL ON COVER (according to the Alvaro Castro Harrigan coll.) (T) (Tax Method: Margin System)