Authentic Chanel vintage leather small agenda cover

100% authentic Chanel vintage leather agenda cover, it was from late 80’s or early 90’s collection, the hallmark and number is inside of the agenda, however, cannot find the authenticity card anymore. The condition is still very good, outside, inside and all edge are good. However I found there a hole on the leather ( last picture), but is very clean cut, I am not sure is that originally has a hole or not in this case. Please see pictures for all the details and measurements