I found these two while CRH and am at a loss as to identify the reason why they happened, or if they add any value. Thanks.
The 1946 looks like ghosting: http://www.error-ref.com/progressive-indirect-design-transfer/ The 1972 appears to be a vice job. The obverse could be from being squeezed of it may have been caught in a dryer/ rotating equipment.
1946 damage and hits e.t.c.That 1972 appears to be a grind and press job? and Kind of looks like a capped die strike,intreasting even though its not.
The 1946-S is called a "ghosting" effect, a definite keeper. The 1972 is damaged. It looks like it was squeezed in a vise with another coin.
Indirect die transfer on the wheat cent, that one seems really obvious. As noted, the other is damaged.
Thanks for the link about PIDT. It's always nice to learn something new, which seems to be endless with coins!