Italian road sign of the beginning of 1900 (after Paris Congress of 1908): dip
Rivista mensile del Touring Club Italiano, № 1, gennaio 1909, A. XV, pag. 42 (https://www.digitouring.it/wp-content/themes/touring-theme/pdfjs/web/viewer.html?file=https://www.digitouring.it/cataloga/media/digitouring/images/0/0/13216_ca_object_representations_media_88_original.pdf)
Touring Club Italiano (the vector file made by Civitas13)