A couple I can find from a previous list of sites I was given: http://www.lincolncentresource.com/Errors/ClippedPlanchet.html http://www.error-ref.com/_curved_clips_/ The full list of sites I got is: http://www.error-ref.com/ https://cuds-on-coins.com/ https://doubleddie.com/ http://varietyvista.com/ http://www.lincolncentresource.com/ http://www.maddieclashes.com/ They're a heck of a lot more helpful than google.
