Hello craig0611
Generally there were three different obverse "looks" to the 2006 One Cent penny.. specifically just under the queen's portrait:

The first one of the three does not have a ..."Mint Mark"... (no "p"..no "Logo") This one is a copper plated zinc core penny...(non magnetic) Mintage is high for this one. The exception to this is the "Magnetic" (copper plated steel) version...(somewhat scarce)
The second one has a "P" "Mint Mark"... meaning "copper plated steel" "Magnetic"...Mintage is fairly low for this one. From my information I've gathered.. was intended for "mint sets" but some were released for circulation ...and again with this "P" penny.. there are some that are "non magnetic" and are (scarce).
The third one "
RCM Logo" came in both "Magnetic" (steel core) and "Non Magnetic" (zinc core) and from what I've seen are/were fairly common.
Hope this helps out a little bit
Edited by change4thebetter
03/04/2013 2:16 pm