H.H. Heinrich is recorded at 12 St John Street, New York (1884) and 102 Fulton Street (1896). A fine chronometer maker, he was born in Hamburg and retired in 1901, devoting his time to studying chronometry.
The punchmark 'KLINE & CO' on the pillar-plate is interesting. It has been accepted that such a punchmark on a marine chronometer indentifies the maker of the frames. With very few exceptions, the frames of chronometers with American names on the dial were not made in America. M. Whitney (The Ship's Chronometer, Ohio, 1985, p. 373) in his entry on Kline & Co. writes 'there is little evidence that Kline produced any chronometers'. This framemaker's punchmark suggests otherwise.