My Rarest lefty's are Rigby double rifle in 470 NE with some exception wood. Even better I was able to by it brand new in the box unfired. Got a hell of deal on it. Got the factory take down case to top it off.
My other rare rifle is a left handed Rigby 416 Rigby double bridge with removable scope mounts. It holds perfect zero off and on. It was listed on a fine gun site. Negotiated back and forth on the deal for a year. It took the guy a year but I was able to get it for the original offer I made.
Sorry I don't have any pics handy. They are both Paso Robles guns not English made though.
