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Measure the thickness - if it's about 1/16" it's likely an original copper/asbestos gasket. Can't get them any more! Scrape it a little and see if you hit copper.
I know of folks that have removed their heads for valve work and reinstalled using the SAME copper/asbestos gasket! It probably belongs in a A4 museum somewhere.
Recommendation to use 2 gaskets is because the graphite gaskets are only 1/32".
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