As an attraction of the Philatelic Meeting in Graz in 1968 letters and cards were perforated with historic equipment of the St. Bartholomew Hospital in Muggia (near Triest). This historic equipment was also used to celebrate the centenary of the Lazaretto in 1967.
On ebay I found an interesting offer of these souvenirs. The ebay seller allowed me to use his pictures for our website. Thank you very much!