Saint Kitts & Nevis
British Colony Countermarked 2 1/4 Pence ND (1809-1812) AG3 BN NGC, KM2. Countermarked "SK" upon French Guyana 2 Sous. Host coin was struck 1780-1790. Known colloquially as a 1/4 Black Dogg. The host coin is weak, but the countermark is strong. Very seldom encountered in any grade. The second issue 2 1/4 Pence appears far less frequently than the first issue 1 1/2 Pence.
Estimate: 350-450 USD