Nanzhao Kingdom, 9th century AD
This gilt statue is "Acuoye Guanyin" ("All Victorious Guanyin," Skt. Ajaya Avalokiteshvara). According to legend, this form of Guanyin first manifested in China as a spiritual teacher (Brahmin) from India. The statue was recovered from the 9th century Qianxun Pagoda in Dali.
The museum label makes a hash of this information, at least in English, giving both a misleading identification and an incorrect date. Never trust museum labels!
Reference: Howard et. al., Chinese Sculpture, p. 346-347.