AI Description is as follow:
This item is a hand-carved stone relief fragment of Guanyin (also known as Avalokiteshvara), the Bodhisattva of Compassion. These fragments are often identified as "bas relief" or "high relief" carvings, typically made from materials like white marble or alabaster. [1, 2, 3]
Key Identification Features
Material and Authenticity
While high-end antiques can be made of white nephrite jade, which has a waxy luster and stays cool to the touch, many decorative collectors' pieces are carved from white marble or soapstone. [1, 2, 3, 4]

A family member was visiting China when it was first opened by Nixon in the 1970`s.  In this trip he was given a opportunity to buy this object by a young Chinese boy just before leaving on his flight.  The boy said it was from a wall that was recently torn down.  Unfortunately the buyer of this item was unable to provide any additional information before he passed. 

The Age?  Unknown outside of it being prior to when China was opened to foreign visitors in the 70s.  It appears well worn indicating it was possibly made prior to the Mao era of China.  No markings appear on the item.

Enjoy this limited opportunity to get a unique part of history in your collection!