Hi, this is my first picture, but i've yet many insulators, because i started to collect them more than a year ago. These five 3 shells Fidenza n°25 are very particular; upper and downer shells are light green, middle is dark green; downer shells are marked 1939; probably the farm changed color in last 30's, but had some unused dark green shells from the oldest production and used them with new light green shells.