The other one is a smooth bbl. gun. It also has a V at the end of the serial number, meaning 2 3/4" only. This gun has an S for a prefix. I checked a chart and that means either 1969 or 1998. How can I know? It could very well be a 1969 that hasn't been used much and well cared for.
Also, I was wondering what the approximate value might be of these guns. They are in very nice condition.