The reamer, punch and sewing awl you find on Swiza knives can be used for many tasks. It is very good for things with leather. The tip and construction on this is not very strong on harder materials.
It is very sharp and as mentioned it is very nice on leather and softer materials. Wenger had a few different types on their history and products until the end. The Swiza design is very different and it got some of the design you see on the 1961 Alox type
but not similar.
If you need to sharpen or maintain the sharp edge on it:
It takes a long time before you will
have to touch it up. When you do just use a fine diamond coated stone and follow the angle set on it. Then remove the little burr on the back of it. It is not necessary to have it razor sharp. You do not need more than a fine surface on this and only use light
pressure. Try to preserve the tip on it. You follow the set angle the best you can and use both cross and lenghtwise motions.