Mauritius, Express Delivery (Inland), 1904, 15¢ on 15¢ ultramarine, surcharge double, tied on piece by light 1904 Mauritius town cancels, rich bright color, wide margins, Very Fine, a choice example of this very rare double surcharge variety; with 2012 R.P.S. certificate. Scott No. E3Fh. SG No. E4b  £3,500 ($5,660). $0 (Image)