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Stairs in Belgium (also: "Trappen in een stad") was part of the annual publication (the 8th) of the Portefeuille der Nederlandsche Etsclub in 1893. A Portefeuille usually contained 10 etchings. These were all printed on thin paper and attached at the top (usually in the corners) to a large sheet of thick paper in order to include each etching from the portfolio in the same size in the shipment.
"Trap in België" is still attached to this sheet of paper (57 x 40 cm.) and is thus part of the portfolio from 1893, as no. 10. The sheet has 3 small tears on the edges)
"The Staircase in Belgium" is also part of the collection of, among others, the Dordrechts Museum, Rijksmuseum Twenthe and the Kunstmuseum Den Haag.
In the book "Willem de Zwart" by Richard Bionda the Trap is depicted and described as no.47 / page 101.