The words you most frequently run across when referring to the coatings on the Series E is "simpler coatings". It doesn't necessarily mean "not multi coated".
The prime lenses optical design were all simpler 5 or 4 elements. The revered 100mm f/2.8 is only a 4 element design. They all have a purplish coating colour. The zooms had more elements in their designs and the colour of their coatings were a mix of green mainly on the front elements and purple in others.
No where in Nikon literature I could find a reference to their coatings. You make your mind if they are multi coated, or not.
The Series E lenses are all well build and have survived for the last 30 years. In the UK, even the normal 50mm f/1.8 still fetches a high price, normally between £50-65.