Typefounder matrices, one in a time there was a special holder for this, made by Monotype.
Drawings of it can be found in the books of parts... I never encountered one... Are those all disappeared ?
Matrices are plenty, so the will casting them is there. Dan Jones of the Pigment Press in Ontario Canada has done quit some effort to solve the problem.
It sure is not finished, and will be perfected, but here a little film on Youtube:
The face involved is 18D Hercules, a very bold face, a little part of the legacy of a Belgium typefoundry.
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Further experimenting: 72pt casting from typefounder matrices:
To be able to cast these 72pt matrices, the mould has to be changed a bit:
The top plate of the mould needs to be grind down, until it is down the mould opening.


These taper pins could be made shorter at the wide end. Monotype had a reason for them: to make sure that the mould pieces would align properly.