Going through some mixed Czech 9mm and I found one of the “oma” headstamp cartridges, but this one caught my attention since it is the first time I have seen an oma with a primer seal (black in this case), but more importantly the first time I have seen a 3-stab crimp holding the bullet on any Czech 9mm. Is this odd, or did they occasionally do this?
Also shown below are two versions of a relatively scarce headstamp (as far as Czech 9mm in the U.S.) with both red and black primer seal - is there any significance to this? The black primer seal is on a load with copper-clad bullet, and the red one is cupro-nickel. All 3 cases are brass with varying degrees of cleanliness / oxidation.