15/16" with intact tiny loop on top rim edge. Each side states the office and date while each man's name appears on the ferrotype. Both images are outstanding in their brightness and sharpness. On the McClellan side visible to the naked eye is a tiny black dot on his cheek. Under magnification there is additional even tinier wear but under normal viewing the only thing that shows is this single tiny black dot. On the Pendleton side there is a faint tiny line of black dots to the left of his shoulder but again without magnification appearance of the ferro is Exc. With magnification there are a couple of extra tiny black dots all quite trivial since they don't show to the naked eye. Extremely Fine.