How to know more about a Yamaha 9 ft grand piano that is supposedly from the late 50s to 60s with the short serial number 977700 - Quora
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Finding Piano's Serial Number - Piano Artisans - Piano Restoration, Piano Rebuilding, Piano Moving and Piano Service
![Free Piano Serial Number Atlas | Find the Age of Your Piano | Seattle Piano Company — SEATTLE PIANO COMPANY Free Piano Serial Number Atlas | Find the Age of Your Piano | Seattle Piano Company — SEATTLE PIANO COMPANY](https://images.squarespace-cdn.com/content/v1/5ecc06dc5a79d433e0982e7f/1597109281777-8BRDER2QWI09HE53H48D/Yamaha+G5+Grand+Piano-26.jpg)