Keisuke Serizawa Art Postcard Collection II

This is a postcard that my father purchased a long time ago at the Shizuoka City Serizawa Keisuke Art Museum and it has been sleeping in his study drawer ever since. It is new, but over 40 years have passed.
The work is titled Work II, and this is believed to be the second one. The last photo is a reference photo showing how it might look framed, and this is not for sale. Please note that only 8 postcards are included. If you wish to bundle items, please let me know in the comment section.