genuine

The museum curator verified that the painting was a genuine Rembrandt, dating back to the 17th century.

(Chinese) 博物馆馆长证实，这幅画是17世纪真正的伦勃朗真迹。

I have a genuine copy of the famous book signed by the author himself.

(Chinese) 我有一本那部名著的正版书，上面还有作者本人的亲笔签名。