Uncoated lenses pretty much went out with WWII. I had a Kodak 35RF which had a hard coated lens, it was made according to the serial in 1941. The Rokkor of which you speak was made in the 70s, everything was coated, many already multicoated by then.
Originally Posted by brian steinberger
The single coated 40mm Rokkor is a fine lens, I used one and it is excellent.