. >> reporter: after flagg's death in 1960, kinsler helped clear out flagg's new york apartment. >> ithe window and everything was in there. everything was in place. >> reporter: but the next time he fit vitted the beloved nude had vanished. kinsler figured maybe a building worker stole it. >> i said it's probably the superintendent or an elevator operator who got his kicks out of looking at a really hot nude. and i bet you it's in somebody's apartment in brooklyn. >> that always intrigued me, because i wondered for many years had it mysteriously disappeared or had it bn stolen or was it completely lost to time. >> reporter: collector and attorney james head writes about what he calls the american illustrators of beauty. two years ago, he saw this picture in an auction house catalog. sure enough, it was the missing nude. so you did instantly recognize this picture? >> absolutely. >> reporter: so what did you think? >> i thought i would never see it. this is a mysteriously disappearing nude, and there it was. >> reporter: both head and kinsler alerted heritage auctions they might be se