Check out the Previous Models search page...Looks like they could be from late 70s - 80s time frame.

www.titleist.com/previous-models

I have a similar set. If grips are good and not dried out I would keep them.
They are only tour models as far as I know and mine are circa 1978 as they were a gift from my wife.

After looking on the Titleist site, with no results, I checked on PGA value which is the bluebook for golf clubs and this was their response: Why are there no values shown for this golf club? In the unlikely event that values do not appear for a golf club in The PGA Value Guide, a minimum quantity of transactions for the specific golf club model may not have occurred within The PGA Value Guide's analysis window. In order to maintain accuracy, and therefore uphold credibility in the values, a minimum quantity of "recent" historical data is required within the PGA Value Guide's statistical analysis model. Please note, this does not necessarily mean the golf club has no value!

I'll say they are the 1980 model. If you're keeping them as a collector then I would touch nothing. For original grips, they are in unbelievable condition. They don't appear to be worn or slick. Of course, if your going to play with them, you can put on whatever grips you like. For me, I would not play with them and keep them as is.

I have the 1 iron, they are from the early 80's