Vintage Medalist Sand Knit Los Angeles Rams Jersey Player Issue? 70s 80s Size M

Vintage Pro Action Medalist Sand Knit Los Angeles Rams Football Jersey. The jersey has a bunch of marks at the front and a little one on the yellow of the sleeve(see pics). There is no size anywhere the cut of the jersey is like one that is worn on the field. I would guess its a medium PLEASE go by measurements for sizing. It measures 19 1/2 inches pit to pit and 32 3/4 inches from the back of the collar to the bottom front of the jersey. The jersey was washed in a normal cycle in the machine, There is a bit of a chemically smell to it I believe it may be the material used for the numbers I have had similar jerseys in the past with the same smell. It is not over powering but its there.