His explanation for the lateness? World War II.
The man checked out the book on March 7, 1944, while Estonia was occupied by Nazi Germany. He blamed an aerial bombing that damaged the library for the late return of the novel by Eduard Vilde. No other details were given as to why it took so long to return the book.He returned the book, still containing the serial number that allowed librarians to identify it, with an apology and an offer to pay a late free.
Source: Yahoo News