In the 1960s Maserati we’re the air horn people by the 1980s it was FIAMM. There all much of a muchness the only really difference is how many horns they supply air to, usually it’s two. I’m sure there’s an actual part number on eurospares but I bet it’s a generic one. If you look the compressor it’ll have a model. Eg
If they’re silly money just get a modern one for £40.
Found a photo off the net. The Maserati one ive repaired in the past was just like this. The vanes were stuck. The rotor is offset and the vanes are free to move in the slot so a bit of corrosion and they just stopped the motor.
<p dir="ltr" style="margin-top:0; margin-bottom:0;">Harry Moss Maserati Air Horn Foil sticker. From another mystery envelope from an office clearance. These look like the foil stickers that are on the compressors for Maserati air horns as fitted to many classic car. Would certainly finish off...