My teacher recommended that I get the piano manufactured before the mass-production era, approximately the one made on or before 1945. His recommended piano makers are:

Grotrian Steinweg
Bluthner
Bosendorfer
Ed.Seiler
Berdux
C.Bechstein
Feurich

Also, the teacher shared the actual examples of the old piano available on eBay:

Piano Grotrian-Steinweg

Grotrian Steinweg 120 Upright. c.1930 Oak. Fully Reconditioned-5 Year Guarantee

As he suggests, I shall check some stores that sell such old pre-owned pianos next time I am in Japan.

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