Penn prints New york lithographie exerce t il toujours?

Good Morning I have Penn Prints with markings of Occupied Japan. It is of Tung Pang Ta (1699-1769) Chinese Landscape IV....I have had these about 40 years and the gentleman I purchased them from said he brought them from Japan. I am looking for the value and to see if there is any market for them. If you have any knowledge regarding these, I would appreciate any help Thank You cnns1@hotmail.com