Hi Matt. It's been a while. Nice of you to pop in. I hope your
studies are progressing well.
A brockage is impossible if two planchets are struck together.
However, it IS possible for there to be an unusually strong "ghost
image" of either the reverse design, the obverse design, or both.
The die's design can bleed through the thinned metal of either coin.
I have seen occasional ghosts so strong that they were mistaken for
brockages. You mentioned this possibility in your question when you
brought up "strike transfer design through the uniface piece".
It is also possible to "enhance" an indent or a uniface surface by
pressing a struck coin into the available blank surface while the
opposite face is supported by hard rubber or a similar firm, but
giving surface. I don't see this done very often, however.
--- In email@example.com
> I have a question for the board. Imagine you have a mated pair
> by a single strike, so that one planchet overlaps the second and
> both recieve a strike from the dies. Now you have one piece which
> offcenter and uniface, and another struck on-center but with an
> indent for the other planchet's struck portion to fit into. Is
> any way for there to be brockaged design in that indent while
> remaining a true mated pair? Can the strike transfer design through
> the uniface piece, or can there only be brockage when a previously
> struck coin is used to indent another? Thanks..Matt