A taiko musuba (square knot), 2 part Nagoya type obi. Known as a tsukuri obi, tsuke obi or easy obi.
Nagoya obi style, with stylised kujaku (peacocks).
Made and bought in Japan
Most obi, including two-part, pre-shaped taiko knot obi, require an obijime and obiage to hold the rear knot in place, both of which are always bought separately. With a taiko knot style obi, an obi makura (obi bustle pad) is worn inside the knot too, to pad it out at the top, though a few two-part taiko obis have a makura already inside the knot, however, most don't. One can buy actual obiage, obijime and makura or one can improvise with these items
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Condition:
Excellent

Measurements approx:
Rear knot section 29cm wide x 33cm deep
Sash 144cm long 14cm deep
Obi are one-size-fits-all items