"The viola illustrated here may be well regarded as one of the most outstanding works of Jacobus Stainer. It is built on generous proportions, the body measuring 16-11/16 inches the width across upper bouts 7-15/16 and across the lower 9 Es inches. It bears the original manuscript label dated 1670, or about the time the master was at the zenith of his powers. The original varnish remains in plentiful state and is of a lovely golden recolor. The instrument came to English possession from a noble family of Hungary; about 1885 it was acquired by the late Baron Knoop, a collector of fine discrimination who in his time owned many fine instruments. It later passed to Hill & Sons and from them was purchased by Nathan E. Posner in 1924. The May 1925 edition of The Strad carried an article regarding the viola written by the late Towry Piper, accompanied by fine plates.In 1926, through the intermediary of John Friedrich & Bro., E. N. Doring sold the viola to Alexander J. Stuart, who was at that time a resident of Detroit. The instrument has since then changed hands and is in private possession at the time of this writing."
The Troubled Life of Jakob Stainer - Part IV, C. E. Mertzanoff, William Lewis & Son, Chicago, 1943