Clamp stand - for craft? Tapestry? (Harwell OX11)

Very adjustable wooden stand. Not really sure what its for, but its got an articulated wooden arm that can be adjusted in 3 places by means of wingnut bolts. On the end of the arm is a clamp type arrangement, also adjustable with wingnuts. No idea what its supposed to be for, could be a tapestry stand, good for holding something, anyway.