The Pamiri rubab is a six-stringed fretless lute from Tajikistan.

Origin: Badakhshan region, Tajikistan

Description: Round bowl covered by hide, six strings made of catgut or nylon, one attached from mid-neck rather than usual head to bridge.

Usage/History: Generally an accompaniment for poetry and singing. Played held across the lap (as seen in attached video).

Related instruments:
part of r*bab family (https://musicbrainz.org/instrument/30cb46c6-2694-4348-a7c6-3fb12666d7e5)
Rubab (central Afghanistan) (https://musicbrainz.org/instrument/742e637-c7b4-422c-ad56-f7fafbd961bb)

References:
https://www.youtube.com/watch?v=Iy2C9boT0LU (video)

http://mus6155musicofasia.weebly.com/instruments.html
https://en.wikipedia.org/wiki/Pamiri_rubab

Image links:

http://oart.eu/joomla/the-physical-rubab