The insulator in the picture is a well known italian 2Um or 1907 type but in an unusual brown colour. Untill now we knew the model in blue, blue with grey stripe at the bottom, white, white with red stripe at the bottom and in the middle, green (reinforced and not reinforced). This is the only one known specimen in brown colour and has been rescued in Lazio region from my friends Christian and Guido. Another amazing discovery for italian collectors!
Update: another specimen has been found by me in an small village in northern Italy. Now the specimens in brown porcelain known are two.