This is a 12 volt 4 watt single contact bulb for use in instrument clusters, courtesy lights, and other low-power lighting devices.
Circular, single contact, 1/4-turn socket.
Fiat 124 All (Instrument Cluster all, Side Markers to 1969, Trunk 1978-On)
Fiat 128 All
Fiat 131 All
Fiat 850 All
New and Unused.