Help Identifying This Headbadge
 

A friend turned up a bike he can’t identify- He had a photo of the headbadge on his phone, which I photographed (attached below). I can’t make out the rider’s signature but I’m guessing this is an easy one for some of you folks.
Thanks much!
Joe
https://cimg4.ibsrv.net/gimg/bikefor...c77b1ba00.jpeg

Girardengo.

Thanks very much!

Looks like Classic Rendezvous/Guy Apple would appreciate a pic of your friends bike if they are willing to share - https://classicrendezvous.com/countr...ly/girardengo/ "Do you have pictures of a pre-1983 original paint & decal Girardengo bike that we could use to illustrate this brand?"

I’ll let him know!

Does it have a similar badge on the seat tube?

(This detail implies some other interesting details...)

He says that yes, it’s also on the seat tube. What does that tell us, Oneclick?

Date and location.
From what I've read/remembered, Girardengo had work outsourced to a prison in Alessandria, including the time when such frames (two badges) were made; which said reading/memory claims was 1962-64.

But as well, can you find out the frame angles?
I have one and the seat tube is 75.<something> and the headtube is 71.<something>, a curious combination as each is somewhat extreme on opposite ends of the scale.

I’ll see if I can get some information on the angles.