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Drywall Screw

What would a drywall screw from 1972, inadvertenly drilled into a copper water line, look like today?How rusty?

I have a black drywall screw that was removed from a ceiling. I'm trying to put a date on the screw. It is 1 1/2", black head and slightly rusty near the tip. It has not disintegrated at all and still measures 1 1/2". It has a Phillips head. If it was from the original construction (1972) and was inserted into the copper water line then, what would it look like now? how rusty would it be? and would it have disintegrated? Were drywall screws galvanized in the early '70's - are they now?
Thank you!!

It would have created a very very noticeable leak. This screw was NOT put into a water pipe. It was more likely in free air and rusted due to the moisture IN the air, but since there is so LITTLE rust on it, it is even MORE likely that it did indeed hit the wood. If it had been in a water pipe, when that pipe leaked, it would have blown out and been lost long ago.
Al

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