Frames and supports in 15th and 16th-century Southern Netherlandish painting

Bruges, Our Lady of the Pottery Museum 485 On the sides of the wings, incised lines mark the level of the hole for the peg locking system. The peg (a stump of which remains to the left) was intended to lock into the hole in the stile to the right. The pegging is displaced towards the outside to facilitate the penetration of the peg when bringing the two wings together.