Two of three years ago someone on here got the number milled or punched in 3 mm plate, then cut out a part of a tube ant neatly welded the plate in, so it's not obvious the plate is not the tube wall.
During my Polish registration, the inspector just punched the VIN on top of TR5, the diagonal engine bay tube. He tapped each die lightly, so it's an iffy compromise with the tube bent a bit and the VIN barely legible.
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