Going through the checklist directly out of the 1979 Cessna 172N POH (copy picked up from local airport shop) I quote:
"Normal Landing
1. Airspeed -- 60-70 KIAS (flaps UP).
2. Wing Flaps -- AS DESIRED (below 85 KIAS).
3. Airspeed -- 55-65 KIAS (flaps DOWN)."
touchdown, etc.
My interpretation of this is that the top landing speed with flaps operable is 65 knots. When the flaps are inoperable (or you're practicing a flaps-up landing) that top speed goes up to 70 due to the higher stalling speed with flaps retracted. Anything over 65 with a 172 and flaps down and you'll learn how well a high-wing floats in ground effect.