Guitar Diva

Hello to all and thank you in advance for your help. I have inherited a large collection of guitars, basses and studio equipment and I am starting with cataloguing all the guitars. Can anyone tell me what year this John Lennon signature Epiphone EJ-160E was made? The serial number on the paper inside the guitar says R97M 0721 I am also posting some photos. Any help is appreciated as I will eventually sell this guitar.