Scadta 1928: '50 Cts. 50' in red on 10 c. light green, Error of Surcharge, used example of good centering and colour, lightly cancelled in violet. A fine and very scarce stamp, just 100 issued in error Sanabria 7/Gi 6 = £ 1700/Scott = $ 1'700. (Image 1) (Image 2) (Image)