1900 Franklin Institute Longstreth Medal of Merit. Harkness Pa-78. Silver. Mint State, Cleaned.44.5 mm. 44.7 grams. Central reverse inscribed to the recipient TO / CARROLL L. RIKER / FOR / THE RIKER BASIN SYSTEM / 1900.
1900 Franklin Institute Longstreth Medal of Merit. Harkness Pa-78. Silver. Mint State, Cleaned.44.5 mm. 44.7 grams. Central reverse inscribed to the recipient TO / CARROLL L. RIKER / FOR / THE RIKER BASIN SYSTEM / 1900.