The process of going through all the parts and trying to establish their origin or "parentage" can be very instructive.
When I first found my EP&S SA Christmas dagger, well over 20 years ago, there was a lot less known about the SA prototypes. The French book showed the blade of an Eickhorn prototype and Major John Angolia's book shows an early motto Eickhorn blade on page 21- the early production version with the normal grip. That motto matched mine. I compared the dagger components to other early SA components.
Here are three of the photos I took. Excuse the quality - these were taken with an ancient Sony Mavica 1
