From LivingPianos.

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The Steinway model A3 which is nicknamed the “Stretch A”, was only manufactured in New York from 1913 through WWII. Many people regard this as the ultimate Steinway scale design. At between 2 ½ to 4 ½ inches longer than other Steinway model A pianos (including those made today), people describe the sound of this piano as a 7-foot piano in a 6-foot 4-inch case.