I found a 1974D penny with a extra head on top of lincoln's head and markings on the side and rim on where the l on liberty. I can't figured it out if it was Lincoln face or liberty's face.
Let me guess. The "extra head" is Kennedy. These are novelty pieces where a genuine Lincoln Cent was counterstamped with a likeness of JFK and placed on a card with interesting trivia listing "coincidences" between Lincoln and Kennedy (e.g., both had a VP named Johnson, Lincoln had a secretary named Kennedy and Kennedy had a secretary named Lincoln, etc.). You can read more of these "coincidences" at Lincoln-Kennedy coincidences urban legend . Your coin has no real numismatic value but there are a few people who collect them (mainly from circulation).
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Loulou: you need to post the image to a web host and post the image from there. The 1974 is a year that seems to get things added to them. http://imgs.inkfrog.com/pix/coop49/Alabama_Cent.jpg
You might try opening an account with photo bucket. They offer a free service. Some here use them. I don't, but others seem happy with them. http://photobucket.com/
You can click on my avatar and I send the image from there. I'll be glad to post it if it come through. Send it as a picture and an file. Maybe they will get through one way or the other. I'll be watching for it. Coop
<a href="http://s1232.photobucket.com/albums/ff378/loulou1066/coins/?action=view¤t=1974dpenny3.jpg" target="_blank"><img src="http://i1232.photobucket.com/albums/ff378/loulou1066/coins/1974dpenny3.jpg" border="0" alt="Photobucket"></a>
http://s1232.photobucket.com/albums/ff378/loulou1066/coins/?action=view¤t=1974dpenny6.jpg http://s1232.photobucket.com/albums/ff378/loulou1066/coins/?action=view¤t=1974dpenny3.jpg http://s1232.photobucket.com/albums/ff378/loulou1066/coins/?action=view¤t=1974dpenny4.jpg
Use the direct link for the image: http://i1232.photobucket.com/albums/ff378/loulou1066/coins/1974dpenny4.jpg It is the second box to post images. I can't see from the images what you referring to. ADDDED: I just noticed you figured that out.
i sign up to photo bucket like you suggest thank you. the extra head is on the back of lincoln's head i was using my iphone when i took the picture
Looks just like mine! Just kidding! Try a camera with macro or if you have a scanner, increase your DPI (PPI) and scan the coin, then crop it. Hopefully that will give us a clear enough image to examine.