The image is taken from MGR movie records.
The First successful movie for MGR as Hero is his first Hero movie Rajakumari and not Manthiri Kumari as you have mentioned.
Secondly En Thangai record note number of days.
Nearly 17 years back I had the record for all MGR acted movies and which theater it was released. Unfortunately due to shifting and other reasons I lost most of the books, paper cuttings and pictures.
Below is the record for Oli Vilakku.
A week back Sathya showed two designs for the anniversary. Second design made as Poster for this year. Today Sathya handed over the Poster done by Ponmanachemmal Sri MGR Bakthargal. A Very young MGR’s portriat adored the poster.