That's not another L, that is just part of the stamp itself.
I think it's all factory, btw.
JohnZ said:
Yup, the operator bumped the "egg" while he was re-positioning the tool and knocked one of the number rings off-index; I've seen that before. Nobody paid any attention to it in the plant, as it was "invisible" - the heater or A/C case was installed over it before the body got to the first Chevy Trim Line inspector.