Reproduction of the original. Although generally assumed to be a 750 series part, this valve was certainly used on 101 series Spider Veloces in 1960, possibly also on Spider Normales of that year as well? There is no such thing as a definitive application when Giuliettas are concerned.
 
Part Name: Heater Valve, 750 & Some 101 Series Thumb Wheel Type
AlfaStop Product Code: 1CS102
Original Alfa Romeo Part No: 1483.54.711
Model: Giulietta 750 & 101
Quantity Per Car: 1