Probably safe to assume this was originally ordered through Spence Wolfe (Cupertino). Wolfe always spec'd Campy 1010 dropouts, which Singer rarely used otherwise. Nothing against Mr. Wolfe, but that makes the frame less attractive to me. If I wanted a Singer, I'd want it to reflect the design preference of the builder, not some bike shop.
To get top dollar, a Singer should have more bells, more whistles. Like brazed on brake pivots, remote actuation lever for the bottle generator, Singer steel stem, and it should not be missing the custom rack this was clearly made for. With the rack attachment points on the seatstay rather than the dropout, you can't just bolt on any old Velo-Orange or Nitto rack, you really should have something made to fit, which is stupidly expensive especially if you want it chrome-plated. Yes a Pletscher (or any adjustable rack) would bolt right on, but a Singer deserves a nicer rack. Of course not an issue for someone was wasn't ever going to use a rack anyway, but then you have those braze-ons there, looking sad. No problem functionally but most people don't buy a Singer if mere function is what they're after.
My long-windedd way of saying that though it's my size, It'd have to be half the asking price to make me raise my hand. But I'm a cheap bastard, and I fully expect this one will sell, to someone less crotchety and cheap than myself..