I just received this, included in a “trade” box. Hand crafted by the sender. I really don’t think he was in a trench when he made this, but the item could, possibly, be classified as trench art. It is to me, so . . .
As you can tell, in the “exploded” example, there are a number of pieces of shrapnel arrayed as if in the early stages of detonation. We all know the frag segments are rarley this consistent, but it provides a stunning example of the effects after pulling the pin. These were range finds and are certainly not pieces from a lone grenade. Had probably been laying around for years, so assuming they are from the MK2 variety of U.S. ordnance.
And they were launched, so sorta ammoish. Hope that counts.