Solved -PJ693- MM racing car bodied by Bonora, around 1939

[Paul Jaray]

Not Aermacchi.

[nicanary]

Moto Rumi ?

[Paul Jaray]

Not that.

[nicanary]

FB-Mondial?

[Paul Jaray]

Not that.
(It won't take too much...)

[nicanary]

Frera?

[Paul Jaray]

Not Frera.

[nicanary]

Aeromere?

[Paul Jaray]

Not Aeromere.

[nicanary]

This is getting embarrassing.  I'm simply making guesses based on a list obtained on the internet, as I'm sure you realised a long time ago. I have no idea what this car is. I thought by now that someone else would have joined the guessing game.

Ceccato?

[Paul Jaray]

Ok, time for some clues then.
It is not in a list I saw at Wikipedia.
It was closely connected with another brand, in that list.
They closed down in the late 50s (early 60s according to a couple of sources I just read).
The connected brand is still active and you did not mentioned it already.

[nicanary]

Italmoto?

[Paul Jaray]

Not that.

[D-type]

A blind guess:  ISO

[nicanary]

Piaggio?

[Paul Jaray]

No x 2

[Paul Jaray]

Very short name...

[nicanary]

Very short name...

Two letters?

[Paul Jaray]

Yes...locked for your next reply.

[nicanary]

MM ?

[Paul Jaray]

Yes!
For the 2nd point now, who did the body?
Open to all!

[nicanary]

Even though I now know the marque, there's still nothing on the internet. Guess - Zagato?

[Paul Jaray]

Not Zagato. This 2nd point won't be easier...

[nicanary]

I assume that this is not a well-known coachbuilder?

[Paul Jaray]

You are right.