It is 「大清( Great Qing Dynasty)乾隆年(years of Qianlong ) 製(made)」
乾隆 [en.wikipedia.org]
The seal indicated the product was made during the reign of Qianlong Emperor of Qing Dynasty (1735-1796)
乾隆 [en.wikipedia.org]
The seal indicated the product was made during the reign of Qianlong Emperor of Qing Dynasty (1735-1796)