Redbelly
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This is awe inspiring. Congrats! What is the "HOB" for? Is it the paired other side of the mold? (Cup one side, HOB other?)
Just a quick answer to this question...
The HOB is the "Key" to the mold.
There is only one. (It really is the Holy Grail!).
Remember this is old school. (Now this would be done with CNC machines)
They would cut rolled steel tubes still hot and soft and "stamp" each piece to form an "unfinished" cup. They could make a lot of unfinished cups because the cost was low. They would then typically take only the number they needed for the mold "shoe" (40-20 per side) and lathe them into "finished" cups. That was the expensive part. If I remember correctly the unfinished cup cost $40-60 and the finished cup cost in the $400 range.
As I indicated in the OP I had only received unfinished CSQ cups. David told me that because it wasn't going to used for chip production that I could find someone to lathe one of the unfinished cups. The tolerances for cups placed into the actual mold are extremely precise.
I found someone and he gave it back shortly after telling me that because it was rolled steel it was incredibly hard for him to lathe it.
I'm patiently waiting to have a couple of the unfinished CSQ cups made into finished cups. Right now all I have is an example of an "attempt"!
From left to right you have the HOB, Unfinished Cup, "attempt" to Finish, and the Finished Cup (dice/car)