Lot
1876 
Liberia, 1936, 6¢ on 2¢ Violet, "Via Air Mail" Surcharge, Cockrill third printing (No. 8), tropicalized o.g., bright and fresh, Very Fine, a very rare 3¢ Provisional Trial Airmail overprint. Sanabria No. 6. Scott No. C1 Estimate $400 - 600.