progressive, indirect design transfer
- Here's another nice example of progressive, indirect design transfer
(it's not a die clash):
The puffy, incuse image of Lincoln was transferred to the reverse die
through the medium of many thousands of planchets struck by this die
pair. It's a form of die fatigue.
This effect is most often and most dramatically encountered in cents
minted in San Francisco in the years 1946, 1947, and 1948.