Panama, 1903-04, Registration, 10 on 20c blue on blue with manuscript "Panama" overprint, manuscript "306", used with Panama 1903-04 10c orange with Bocas del Toro overprint, uncancelled on Kee correspondence cover to San Francisco Cal., purple Mobile (2.18.1904) backstamp transit with Mobile registry label (FX-MOB1) affixed, slight soiling and extra gum around stamp, still Very Fine, ex-Helme. Scott No. Panama F21 var. + 154  Estimate $1,500 - 2,000. ONE OF ONLY TWO RECORDED EXAMPLES OF THIS REVALUED 10C PANAMA OVERPRINT REGISTRATION LABEL. The Bocas del Toro post office seems to have overprinted stamps as they were needed. This cover has a Colombia F17 with a black manuscript "Panama" overprint and revalued with penstroke "1". $0 (Image)

Panama, 1903-04, Registration, 10 on 20c blue on blue with Bocas del Toro overprint, red manuscript "10" revalue, manuscript "844" number, used with Panama 1903-04 50c bister brown block of four and 1p lake with Bocas del Toro overprint, tied by partial strikes of purple Boca del Toro (4.9.1904) cds on cover to Costa Rica, reverse with Port Limon (4.9) transit cds; some soiling, Fine. Scott No. Panama F23 + 156 (4), 157  Estimate $750 - 1,000. ONE OF ONLY TWO RECORDED EXAMPLES OF PANAMA F23 ON COVER. Both covers recorded with Panama F23 are from the same correspondence mailed on Apr. 9th 1904 to Costa Rica. $0 (Image)