Until 1700, the use of wooden cross-windows was common in Leiden. The design features a center post and intermediate sill that divide the frame into four. The two upper sections are provided with leaded glass until about 1650, afterwards also with glass in wooden rods. The bottom two window openings have wooden turning shutters.
Wooden cross windows are still visible in several places in the city centre and have been documented in building history research. Cross-windows can be seen nowadays in the side facade of the city carpenter’s yard (1611) on the Smidsteeg. The cross-windows in the model are designed after a documentation of the windows of Levendaal 153 in Leiden, built in 1659.
source: H. Janse, 1977. Vensters - Constructiebeschrijvingen van vensters in Nederlandse monumenten tot de 19e eeuw, Schiedam.
Reconstruction drawing of the cross-windows - Levendaal 153, Leiden (d. 1659) [PJ De Vos]