The large brush pot is of cylindrical form, glazed in monochrome blue on the exterior, crackle pattern on the interior, bottom unglazed, interior bottom showing glaze crack.|||Height: 7 1/8 in (18.1 cm) Diameter: 7 5/8 in (19.4 cm)|清康熙 祭藍釉大筆筒|直壁形筆筒，圓口，器型規整，儀態端莊。胎體堅質而細膩，有明顯重感。內壁施白釉，釉面勻淨亮白而肥潤，外壁通體施祭藍釉，釉色深沉神秘，雖無紋飾，卻顯素雅之氣，當為一件不可多得的文玩用具。