Not so sure it would bring opening bid let alone more Kurt - especially after repeated eBay attempts 'burning' coach by perpetual new eBay accounts (same seller throughout, zrepo).
Notice how there have not been interior shots? It's only
"100% complete" if one isn't familiar with what the starting point was. Rear compartment floor has been cut out with accompanying hardware missing. Also note seller skirts rust issue, never mentioning it. That's because the front floors (at least) are rotted out.
Clean or dirty, I estimate $3k-$3500 tops on best day, even being a '60, as S&S is least sought after coach builder in this era. Not opinion but rather based on what others have brought. The only
comparable '60 S&S I'm aware of that has sold publicly in last couple of years is Clark's ($3600?) that went from SC to CA. '59 below sold privately 9/12 for $3200, which was a pretty fair deal given scads searching for a '59. Certainly would have gone higher if hitting open market. Not easy gauging value drop off from '59 to '60 (usually 30-40%), then considering what it may have brought, before applying to eBay '60.