Just to update those who are following I did finally find and purchase a 28-2. It has a 6" barrel and "S" serial number that dates it around 1966. It also has the original diamond grips with the same serial number. Ended up paying a little more than my original plan but not much.
Pictures to follow in a couple weeks after it arrives and I go through all of MD's waiting games.
Thank you all for your ideas and advice.