Square Piano 1725:
From the estate of cellist Gaspar Cassado, and dating from 1725, this rudimentary pianoforte bears no identification mark othe than what might be interpreted as a date 1732 inked in on the soundboard. Range 4 octaves and one note. Purchased in 1969.
From Naples, reconditioned in England and the date of which he gives as 1730.
Recognized authorities have up to now considered that the earliest extant square piano in existence is one by Johan Socher dated 1742. (Star 29.8.70)