For me, right now at least, it'd be a 2005 Mondonico that fits, a Riv Roadeo, a Mitch Pryor Rando Project bike, a Boxdog Pelican, or a Boulder Randonneur, probably 650b. Are these production bikes? Not sure, but they are not full-custom.

Of course, there's always a new Alex Singer ... nawwww, those can't be custom!

Nearly forgot, a Mercian Audax in 853. Again, is it production? Well, again ...