Here is a painting from the early 17th cent. which shows a boy wearing a small dagger. I assume itīs a piece like this...
https://www.flickr.com/photos/97048587@N04/16737228865
And here is the big brother (from the blade) of the tiny dagger, also with a similar marking...
http://www.hermann-historica-archiv....db=kat59_a.txt