I am trying to find a mortise lock that uses a pair of large brass knobs mounted in the center of the exterior panels of a set of French doors.
There are smaller knobs of the same design closer to the edge of the door on the interior panels. The mortise lock is removed, but I can deduce it's design from the remaining knobs.

So the interior and exterior knobs have separate spindles, several inches apart, but at the same height, and they are held in the door by a brass washer that is visible on the opposite face of the door.

Has anyone seen or heard of a mortise lock of this type?