The Calendar Clock Face is an unusual painting from c.1500 by an unknown painter in the collection of the M - Museum Leuven.

Nothing is known of the clock face before it was discovered and documented by Leuven archivist Edward Van Even in the 19th century.

He was a friend of William Henry James Weale, who included it in his 1902 Bruges exhibition of Flemish primitives with the following entry: "284.

In the topmost compartment of the fourth circle, the three brothers Massijs are seen: Josse, the eldest, busy mounting a church clock; Quentin, painting a portrait; and Jan, grinding colors.

"[2] The painting arrived in the Leuven city collection via the Demunter bequest in 1938 and has been in the museum since 1976.