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Dear Mr. Cangemi,
Thank you for posting your request on History Hub!
Kalotype or calotype or talbotype is an early photographic process introduced in 1841 by William Henry Fox Talbot that used paper coated with silver iodide. This process was abandoned since it was not possible to remove all the chemicals from the paper and eventually would destroy the image. In the late 19th century, the picture postcard became an inexpensive way to mail images to friends and relatives.
Unfortunately, we are unable to locate specific information about the stamping on the back of the photograph. Since the card originated in Palermo, we suggest that you may wish to contact the Archivio di Stato di Palermo.
We hope this is helpful. Best of luck with your research!