I recently acquired some fired Securiblank cases and 9x19 and 5.56.
The headstamps on my examples are IVI 9 m m 17 and IVI 5.56 18.
I did a search and haven’t found much about these on the forum other than brief mentions.
These are “silent blanks”, which is an interesting concept in that weapon cycling can be demonstrated in a classroom environment with no noise, flash or smoke. They are used with weapon conversion kits to prevent other types of ammunition being accidentally fired.
As far as I can tell, these are powered by the primer only.
More information here: