I have managed to come up with a few rare lefties over the years.
A LH Zastava in 9.3x62 with a Lonewolf stock.
A LH Sako in 35 Whelen Imp with a nice piece of walnut. This gun also has a Griffin & Howe mount AND a peepsite setup that you can stll use WITH the scope mounted.
A Hart action with Hart barrel in 300 WSM riding in a Lonewolf stock.
I have several other lefties but these are the ones I would consider rare.
Heaven has a wall, a gate and strict immigration policy.