Ming Official-Cast 25-Taels Waisted Silver Ingot, cast from pure silver in traditional waisted boat shape covered with natural honeycomb pores on surface, complete inscriptions of reign year, prefecture, silversmith and supervisor hand-chiseled on vertical sides, mild silver texture with uniform handed-down silvery grey aged patina and distinct cooling folds on edges, overall height 1.5cm, length 11.5cm, width 7.5cm, net weight 966g, large 25-tael official ingots of the Ming Dynasty are rarely preserved, intact tax silver ingots with full inscriptions serve as physical historical materials for ancient finance and currency history, a top-tier heavy collectible among ancient silver ingots.