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With that scale comes a need for stronger supporting material and construction to deal with all that tension. A high tension scale takes that into consideration, and shows they cared about making an "instrument". If too thin a piano wire string next to a decent copper wire string of the bass section, then a noticable change in tone and maybe volume in some pianos will be heard. (21 is thicker, thus making the tone more deep, and having a good transistion to the copper wound bass strings. Your low end before it gets to the copper wound strings of the bass notes may have size 21 strings, compared to some other consoles going to 19. For a simple example of your piano's string tension, your highest note and just a couple from it may have size 13 strings, rather than starting with 12's). Better tone in general, depending on hammers, (which they used good hammers also). It's a high tension scaled piano, meaning the total pounds of string pressure wanted by the manufacturer, calls for thicker strings on certain notes than their counter part pianos of lesser string tension. Built in a time when the competition was heavy, with more makers than in times since. From what I remember, they were good, solid pianos, with a good tone. I tuned a few over my 33 years of tuning.