According to that page the 16 Rokkor when through the same changes all MC and MD lenses went through in the 1970s. You will note that their was only one optical change in the lens, and that the first optical design was borrowed by Leitz for the Leica R 16 Elmarit, pretty good certification of it's quality. Minolta, like all of the manufactures, continually improved the coating on their lenses in the 1970s. Most of the small changes noted on this page simply are the result of a new coating being used. The later lens will be less flare prone, but that doesn't change the optical quality of the lens. As with any superwide you will have to be careful with placing very bright lights in you frame. By the late 1970s, with the change to the MD line of lenses Minolta began a process of making their lenses smaller and lighter. This resulted in some optical formula changes. It is not necessarily true that these optical changes resulted in better performance (some did, some didn't), just that they accomplished the goal, smaller and lighter. They also changed from using a very solid all metal construction to using more modern materials, plastics.
You can call to find out what the writing on the front ring of the lens is and that will help determine what version of the lens it is. I wouldn't worry though. If it is a first version then it is the same vintage as your 101, 1966, the year all good things, including me, were born.
