If I do a clean install, will I lose the serial number...

from the "about this mac" application. It's nice to have that there in case your dealing with Apple. I know in the past I did something that wiped it out.

No you won't lose it doing a clean install, the only way I'm aware it would be lost it is if you had the logic board replaced. I'm sure you will write it down just in case though.
Regards,
Roger

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