Leevi's

A guy is selling this nice vintage Lee 101-J jacket: What puzzles me is that it has an internal label that, as far as I know, should be from the 60s (with made in USA and the R mark only) but on the left pocket it has a label with R+MR (that is more 70s) when I was expecting R only. It has a 82 in the back of the buttons Does anyone know if this can still be dated from the late 60s? Was there some transitional period with a mix-match of R and R+MR? I own a 101-J with "opposite labels" R+MR in the internal label but R only on the pocket, it's all very confusing... Any help is appreciated. Thanks