Well, he blew me off, so I reported him.
1953-S Franklins with FBL are far and away the rarest FBL's, worth 100x more than the same grade without. Of 597 offered, Heritage has only ever seen 19 FBL's, and chances are some are repeats. An MS66 is about a $225 coin; a PCGS MS65FBL went for $32,000. They're *that* rare.
They're important enough that a beginner could learn about them before learning how to attribute them. As far as I'm concerned this listing is no better than an 1804 Dollar counterfeit, and just as dangerous.