Rhidian,

your number 395 dagger fits correctly to the chronology I think.

Here is another link about personalized Weyersbergs:
http://phpstack-500133-1583587.cloudwaysapps.com/ubbthreads.php?ubb=showflat&Number=277387&page=2

As you can see, the style of the engraved letter on your dagger is identical to the discussed daggers in the topic.
Here is a photo:

3togetherweb.jpg (101.93 KB, 153 downloads)