Stamping text and figures in identification plate

[steeenogann]

Gents, I need your advise in order to mark a new identification mark to my old 911.
Any advices will be very much appreciated.
I tried several jewelers, but they can print and not punch or they can only punch figures and not letters.
Any ideas will be very much appreciated.
....

[Noah930]

Can you go to a hobby shop (or off the internet) and buy some letter/number punches? Then just use a hammer to mark the plate?

[steeenogann]

I assume it is supposed to be done by a pro, since it must be done from behind. I will up-load a picture of the existing identification plate.

[HarryD]

This gets discussed periodically. what you are asking is, at best, in a grey legal area, and at worst downright illegal. This discussion over at the Early 911S BBS is informative: https://www.early911sregistry.org/forums/showthread.php?99237-Anyone-do-i-d-plate-stamping&