June 2024: Better late than never. Or, at least, I hope so. A brand new Stielhandgranate post, covering the first two models, can now be found here: The Stielhandgranate M1915 & M1916.
(September 2021: For those of you arriving here via some far-off link, this post is currently being replaced by a new updated version. Try again in a few months’ time – I’ll put a link here to the new post as and when).