Is there a way to submit a coin for this service using the online submission form? I don't see one, but then again, I always miss stuff hidden in plain sight.
Maybe you're lookin for the incorrect link at the site, since it is known as PCGS Restoration Service, not Conservation. There is a specific downloadable form necessary, and it is available from this page.
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"Everything is on its way to somewhere. Everything." - George Malley, Phenomenon
http://www.american-legacy-coins.com