Antique Yixing Neizi Waihong Heptagon Fair Cup Pitcher With Buddha Heart Sutra

A simple and primitive antique fair cup. 

Colour: Reddish and brown 
Marks: Tiehua Xuan on the bottom.  Hand-carved 般若波罗蜜多心经The Heart Of Prajna Paramita Sutra on the body.
Size: L: 13.1 cm (spout to handle), W: 8.3 cm, H: 5 cm
Capacity: 160 ml (6.3 oz)
Density: (least 1 - most 10): 6
Condition: In good antique condition with some minor age related imperfection to body.