OK, I thought it was soooo ugly only one would use it... it was HB...
Here is a thought....
Would foundry produced cores have totally died out? If they were producing, and had contracts, they would have kicked up a fuss if the ek makers suddenly said "we dont want any foundry cores anymore..." ,
Based on assumption, but I would think the foundries went on producing till the end, and due to the huge increase in the last two years, the stamped cores took over the slack, and began to way outnumber them at a certain point....