Maybe that's why it got repainted?
The pic of the rear brakes showed that it likely didn't come stock with caliper brakes either, because the seat stay bridge doesn't have that cast-in brake hole, and required the concave washers. Grant Petersen would had designed/located that bridge high enough to maximize clearance, so that the brake pads would be almost maxed out on the brake arms. As for the front, the fork crown on all Rivendells I've seen have central holes cast in, so apart from the missing mid-blade braze-on for Nitto's Campee 32F rack, the front end looks pretty stock.
It's a nice towner for sure!