Bonjour!
This livery is a totally old one. CNAC(China National Aviation Corporation) is an old company that was set up in 1986 and was shared 45% with PAN AM. After PAN AM closed down, CNAC became a independent company. Because of the require of recombination from CAAC in 2002, Air China, China Southwest Airlines and CNAC-Zhejiang Airlines established Air China Groupe and then, CNAC-Zhejiang Airlines renamed Air China Zhejiang Filiale and every aircraft changed the livery to Air China.(B-2376 is on of them)