Porter Yoshida & Company VINTAGE Rare Leather (?) Shoulder Messenger Japanese

i believe this to be leather but i am not certain A really rare tag from what i have found. I would guess its from the 80's but i havent been able to find another bag with this label as this bag is quite old In good condition and gently used. The lining could use a bit of a wash but to me it is totally usable as is Made in Japan Has a zip around the outside to expand the bag Measures 13.5"x10"