A Sicán gold mask, ca. A.D. 900-1200

finely hammered with ear flanges ending in feline head ornaments, the face decorated with bands of red pigment, with gold pupils and gold dangles, the copper eyes and U-shaped nose ornament later additions.

Andre Emmerich, Inc. , 1969

Emmerich invoice notes the copper nose ornament and copper tear-shaped eyes are are replacements . The red pigment is original, there are 2 lines of dotted solder on the back of the PL cheek for reinforcement.
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.

Cf.  Jones and King (1985:66, fig. 4) for the various styles of Sican masks.