- drawing with inscription: "most of these is love," FPz.n.
- facade villa Borghese, architect Giovanni Flaminga
- etching of Rederij Rotterdam, signed: Jan Sirks 1926
- south portal to the church at Zutphen before restoration, signed: Oscar Leeuw
- postcard of the Vroom and Dreesmann building in Den Bosch, architect: Oscar Leeuw