The Jiefang Truck (解放). From the series Car construction wall charts (Qiche gouzao guatu - 汽车构造挂图), 29 sheets.
The slogan at the top: Go all out, aim high and achieve greater, faster, better and more economical results in building socialism (Gu zu ganjing, lizhengshangyou, duo kuai hao sheng di jianshe shehui zhuyì - 鼓足干劲,力争上游,多快好省地建设社会主义)