A RARE BRONZE 'DOUBLE PHOENIX' MIRROR WITH INSCRIPTION TANG DYNASTY

cast in relief with two phoenix standing on lotus flowers flanking a pierced central knob, with long tasseled cords trailing up from their beaks, holding a banner with the X-sign, below is a flower and another banner with the character chun (spring), along the rim an inscription in kaishu-style  

Private Asian collection, circa 1980-90, by repute.

There are some heavy encrustation with a mix of brown, bluish-purple, and malachite colors on both sides of the mirror. Some parts of the decorative patterns on the front surface have been slightly damaged by the encrustation.
In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective qualified opinion.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING CONDITION OF A LOT, ALL LOTS ARE OFFERED AND SOLD "AS IS" IN ACCORDANCE WITH THE CONDITIONS OF SALE PRINTED IN THE CATALOGUE.

Translation of the inscription:

(The mirror) is bright like the floating moon, and the material is embedded with the dark spirit.  Forever lasting, the mirror will purify your heart.