How to seal the deal on an item sale

Hi, all. I’m not an experienced person-to-person seller. I put up a pricey item for sale on a public forum and got an immediate response from a Hollywood executive for it. We’ve been talking for several weeks in which he’s pretty much said I’ll take it several times after requesting some revisions. The guy friended me on facebook and has asked for payment options, which I gave him a week ago. He hasn’t responded. Often he does take a few days to get back, but this has been the longest. The item I have is a niche one and it could be a long while before I get another response and have to do this dance again. Should I remind my current prospect of our deal? I was thinking of sending him a formal invoice, but don’t know if that’s obnoxious or would make him see me as even more of a professional.



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