Lincoln Lido 1951 Chassis Number Location

[Lido51]

Hello,

I'm a newbie in this Forum and I'm from Switzerland (not Sweden!).

I have a Lincoln Lido Coupe 1951.

To register the Car in Switzerland it is important that the Chassis Number is punched into the frame.

I do not know if this was Factory done work. I don't found the number on any place others as the Chassis-Number Plate, but it must be there.

Has anyone an Idea where i can find this punched number on the frame?

Thanks for Answer and sorry about my english

Lido51