The one number on a car that's genuinely its name
A chassis number is struck by hand, one character at a time, because it has to outlast everything else on the car — and it's the only mark that never changes, however many times the registration does.

VRN8K2114097, struck into bare metal one character at a time. The depth wavers, the line drifts slightly. A small star at each end. The metal around it is scratched from the striking.
Everything else on the car can be swapped, repainted or reregistered. This can't.
What is actually stamped into a chassis plate?
A single sequence that identifies this specific vehicle, assigned once, at the point it was built, and never reassigned afterwards.
Unlike a number plate, which is issued by a registration authority and can change hands, change country or change entirely over a car's life, the chassis number is fixed to the individual object that came off the line. It's less like an address and more like a serial number stamped into a tool — it describes the thing, not where the thing currently lives.
Why is it struck into the metal instead of printed?
Because it has to survive everything else that happens to the car — repaints, rust, decades in weather a printed label wouldn't last a season in.
Ink sits on a surface and a surface can be sanded, painted over or corroded away without much effort. A number struck into the metal itself is part of the metal; removing it means removing the metal, which is a much harder thing to do quietly than peeling a sticker.
Why does the strike look uneven rather than machine-perfect?
Because it was made one character at a time, by somebody driving a punch with a hammer, not by a press stamping the whole sequence in one motion.
The unevenness isn't a flaw in the plate — it's evidence of exactly how the plate was made, which is part of what makes it convincing as a record rather than a decoration. A perfectly uniform sequence would look printed. This looks struck, because it was.
What are the stars at each end actually for?
Stopping a character being added before or after the sequence without it being obvious.
A star punched at the start and the end closes the sequence off — anyone trying to extend VRN8K2114097 with an extra character would have to strike through or displace a star to do it, which is far harder to disguise than adding a digit to open space at either end.
Can a real manufacturer's plate format go on a shirt?
A specific manufacturer's plate — its layout, its badge, the format it stamps its own numbers in — belongs to them and is licensable the ordinary way, the same as a specific garage's actual stamp would be. The idea of a struck sequence with a closing mark at each end is a manufacturing method, not a trademark, which is what lets an invented plate be drawn from scratch and still be honest about how the real thing works.
Isn't wanting a stamped serial number on a shirt a strange thing to want?
Only if permanence itself is the strange thing to want, which most people don't actually think.
A number that can never be changed, on an object that changes everything else about itself over time, is closer to a wedding ring's engraving than to a spec sheet — it's the one part of the object that's still identical to the day it was made, unlike the disc on the windscreen that expires by design, counting down to the day it stops being valid.
Does it print well?
Yes — struck, uneven characters and a scratched ground are ideal print artwork, because the imperfection is the whole point rather than something to smooth out.
Keep the character strokes slightly irregular in weight rather than a uniform typeface, and let the scratching around the plate stay loose and directional rather than a repeating texture. Cream on gunmetal reads close to stamped metal without needing more than one ink.
How do I get one made?
Describe your plate at JustOG — the sequence, how uneven the strikes should look, and whether to keep the star punches. Pick a direction, drag the crop frame, see it composited on the real garment, and it's made to order and shipped.
Designs other people have published are in the shop.
Twelve characters, struck once, and nothing after the second star.