I have narrowed my choices down to a few but I haven't physically tried any of them so maybe people can chime in:
(1) Velo-Orange/Nitto Montmartre Handlebar
These are classic French porteur bars, relatively narrow at 42cm, center to center.
I have these, and think they are fantastic,
edit:well I guess mine are similar, they are sleeved and engraved, but they are the same shape.
