Description: Source unknown, to be determined. Rare catalogue for Keyser & Swertz, dealers in steampowered machinery. Since this a postmark verso, it was probably send around as an advertisement. The scan shows the opened leaflet. Front carries the title, rear blank. Artists and Engravers: Made by 'H. Emmerich' after an anonymous artist. H. Emmerich (of whom nothing further could be found). Printed by A. Zweesaardt & Zoon in Amsterdam.
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