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Nude sketch to the executioner with an axe (recto) and a stone (verso) to the painting Martyrdom of St. Matthias (1866~1867) --Józef Simmler (波兰画家, 1823-1868)
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Panel of an Altarpiece with Dispute with the Doctors, on verso is Appearance of Christ to his Mother (c. 1520 ~ c. 1535) --Master of Alkmaar (荷兰艺术家, ?-1540)