I personally find filling out customs declarations confusing.

I want to ship a curta from the US to Italy for service. Anyone willing to go on a zoom call or send me a copy of their form I can copy from?

I really want this curta II get serviced.

I contacted Romano at one point and he was unable to help.

Where exactly is the problem? Of course, a form is more or less demanding to fill out, depending on the country... Go to the nearest post office and let them explain you the necessary form or you can fill it out together. I think USPS will be able to help you, you are not the first one who sends a parcel abroad...