A taiko musuba (square knot), 2 part Nagoya type obi. Known as a tsukuri obi, tsuke obi or easy obi.
Navy & gold silk. It looks rather silvery in the photos but is a very pale gold metallic, not silver.
Sash has ties, which get tucked underneath it. The knot is held in place the same way as with all obi, with an obiage and an obijime, both bought separately
Obi should not be washed
Made and bought in Japan
 
Condition:
Excellent condition

Measurements:
Obi are one-size-fits-all items