Christ Crucifixion Enamel Painting on Copper Artist signed

5.75" x 3.75". Signed on the left side of cross as shown.

There are thin crazing area lines surrounding the outline of cross, do not know for sure if they are part of design or craze lines? There is some sort of plaster type hardened material on the back. Photos are part of desription. This item has wear consistent with age/use.