The prototype of 1415, on panel, 142.2 x 106.6 cm, is in the Sant'Ermete, Pisa (M. Eisenberg, Lorenzo Monaco, 1989, pp. no.146, ill.) Executed by the studio of Lorenzo Monaco, it consists of a single panel with rounded top, showing the Madonna and Child with eight Angels. In the present lot, the artist has left out the Angels on the central compartment and has placed two of them on the wings, thus creating a triptych.
As pointed out by Eisenberg, loc. cit., it is not known when the panel was placed in the church of Sant'Ermete.