On the rest day, the Swiss O Week offers a Nostalgic-O-Event, from the time when orienteering still involved more adventure.
- Wednesday 19 July, 10:00 - 16:00
- Map: 1973, 1:16666, contour interval 10 m (the map 2023 is printed on the backside, for the emergency situation)
- Start Start and finish
- Controls: ribbons and stamp boards
- Control locations: original locations of the permanent controll network from the summer 1977
- Map purchase: CHF 10.00 at the SOW information
