Jaap Zeeman, De Nederlandse Staande Klok, Zwolle, 1996, p.121, fig.113.
Tardy, French Clocks, Clocks the World Over, Part III, Paris, 1982, p.262
Johannes Uswald is mentioned in 1782 and 1795 and was probably working in Amsterdam from circa 1765 to 1795. He had a workshop at Oudezijds Voorburgwal 316. Zeeman shows another small longcase by Uswald. Tardy shows a small longcase clock by Jan Hendrik Spiering of Amsterdam, without automaton ships.