GOULD, RUPERT T. The Marine Chronometer: Its History and Development, London, 1923, autographed-FORBES, ERIC G. Greenwich Observatory, vol. 1, London, 1975-MEADOWS, A.J. Greenwich Observatory, vol. 2, London, 1975-HOWSE, DEREK. Greenwich Observatory, vol. 3, London, 1975-LAYCOCK, WILLIAM. The Lost Science of John "Longitude" Harrison, London, 1976, autographed-A Quantity of photocopies of 17th and 18th century tracts on longitude-ROLEX. Four Hundred Years of Watchmaking: An Historic Exhibition, New York, 1974