Stradivari's first known viola. So named because it was purchased by Rolf Habisreutinger on July 7, 1960, the 100th birthday of Gustav Mahler.
The first of Stradivari's surviving violas. The instrument was exhibited at the South Kensington Museum in London in 1872, and was illustrated in George Hart's book "The Violin, its Famous Makers and Their Imitators."
Capolavori di Antonio Stradivari, Charles Beare, Charles Beare, Capolavori di Antonio Stradivari, Milan
According to Doring, the violin still had its original bass bar, as of 1952.
How Many Strads? - Supplemental, Ernest N. Doring, Violins & Violinists, April-May, 1952, Chicago
Instrument #138 at the South Kensington Special Exhibition of 1872.
Catalogue of the Special Exhibition at South Kensington, England, Carl Engel, Catalogue of the Special Exhibition at South Kensington, England, London
"The 'Mahler' was in the possession of the English collector Joseph Gillott, from Birmingham. The entire Gillott collection which consisted of more than ten precious instruments, was sold in 1872 with this viola fetching £51, probably from Mr. P.R. Parera, who kept it in his possession until 1877." – Alessandra Barabaschi
Antonius Stradivarius (Volumes I-IV), Jost Thöne, Jan Röhrmann, Alessandra Barabaschi, Jost Thöne, Jan Röhrmann, Alessandra Barabaschi, Antonius Stradivarius (Volumes I-IV), Cologne