I have repaired the image of the damaged tintype as best I can in Photoshop, filling in the missing bits and enhancing the contrast.

This tintype is probably the only existing photo of Charles Cronea, and perhaps the only photo of him that ever existed. There is a reference in an article published during the last year of Cronea's life to a picture of him made at age 70 (about 1875), but it is not clear whether that image was a photo or painting, and to the best of my knowledge it no longer exists.