7.62x39 LTL rubber bullets from South-Africa

While following a link Lew gave in another thread I found these rubber bulleted LTL 7.62x39.
It seems they are using steel cases from abroad (maybe even surplus?). Has anybody ever seen those and can tell anything on the head stamps?

lesslethalafrica.com/lesslet … l#caliber1

For the 7,62x39 HST is : bxn 73

I like their 9mmP round. It has a similar profile to the Libra Snail AP rounds.