Vintage original 1960s Yamaha No 100 Classical Nylon String guitar.

A vintage, all-solid wood classical guitar produced in Japan by Nippon Gakki between 1963 and 1964, often featuring Yezo spruce tops, maple back/sides, and a 648mm scale. 

Known for its robust construction, warm tone, and 50mm nut width, this mid-range model predates the G-series and is recognized by a mandatory Japanese industrial mark on the label.