Not 70's but late 60's most probably, size is going to command value on them, that for sure. Dark green bar tacks on the rear pockets is a good start, the
inside of the pockets should be single stitch, another true tell as to the age. If by chance it is dbl stitch, then it is 70's...but from the photos I would say
60's. The #8 on the button doesnt necessarily date it as thats the factory stamp.