Ken Owens says that Wales completing a first autumn Tests clean sweep would be "right up there" in terms of career achievements.
Wales host South Africa on Saturday needing a win to make it four from four this month.
They have already accounted for Scotland, Australia and Tonga in extending their unbeaten run to eight Tests, which represents their longest winning sequence since the 2004-05 season.
Wales have not won nine in a row since 1999, while victories over South Africa and Australia during the past six months mean that for the first time, they have defeated two of the southern hemisphere super-powers in the same calendar year.
And their recent record against the Springboks - four successes from the last five meetings - augurs well for Saturday's Principality Stadium clash.
"To get four from four against southern-hemisphere opposition, beating a very good Scotland side and getting a convincing win against Tonga - when we've generally struggled against a Tier Two nation - would be a huge positive," Wales hooker Owens said. "It would be right up there for me.
"We've played some good stuff this year, blooded some players and built some experience. It would be great to finish the calendar year on a massive positive.
"We would be happy going into the Six Nations by signing off the autumn with four wins."
Owens, though, is under no illusion how difficult a proposition South Africa will be on Saturday.
The Springboks arrive in Cardiff after beating France and Scotland following a controversial one-point loss to England this month. They also beat New Zealand in September.
"South Africa are going to be a different beast, and we know how tough it's going to be," he said. "They are a different side to what we've played over the last couple of years. I think Rassie Erasmus (South Africa head coach) has done a good job."