1979 was the year that Deng Xiaoping started serious economic reform in China, following the December 1978 Party Congress. Despite the short Sino-Vietnamese war over the Vietnamese invasion of Cambodia (the Vietnamese stopped the Khmer Rouge genocide) tourist groups appeared in China. So, 1979 was the year of my first ever visit, repeated often since.
Pentax KX, SMC 55mm F/1.8, May 1979. Agfa CT-21 scanned