2r orange 'First Period' EAGLE issue without district overprint issued to SAN LUIS POTOSI with 'RIOVERDE' sub district name added in manuscript reading up at left. A fine used copy with large margins and part oval cancel. A rare early use with the postmaster adding the district name in manuscript in line with the post office regulations, although it was not required at sub post offices. Only a single example is recorded by Frome. (SG 21, Follansbee #19)