The Super Charlin has been for sale for years. I have never found them to be ergonomic, simply unique for the sake of being unique. The same "for sale all the time" with the Pratt and Whitney engineer's Charlin, it seems once someone buys the thing, they list it the same day. I could see myself looking around on the ground for one of the gold inlays, after I patterned the gun and it fell off. I really don't like gold on guns.
The other Charlin was at Barnett's for a long time, if I am not mistaken. Charlins are spectacular guns, you always hear how smooth they open compared to a Darne, but, that is only when they are already cocked-you have to tug a Charlin opening lever just as hard as a Darne opening lever after the gun has been fired. For my use, I have always preferred a Darne, R and V, in that order. Others, sometimes, feel differently. Being a lefty always requires compromise, and I'm resigned to having stock work done in order to get what I need.
We have a bunch of guys right here who crow all the time about how wonderful 3" of drop is for them, but, I can't make it work. On any gun.
If the right Petric came along, I'd be the huckleberry for it, but, I'm pretty safe right here in the middle of the US. I handled a long barreled 20 Petric in St Etienne, that took my breath away, but, I was broke on the day I saw it, and a bit overwhelmed from seeing too much shotgun eye candy during my trip-that will happen when you hang out, eat, and drink too much with French gunmakers of all stripes for a few weeks.
I want to have my V19 restocked to fit this fall, and start moving the stuff I don't use to people who will during the year. I'm a little nervous about selling modern guns that will handle any non toxic shot, however. The future always gets uglier, not better, from a birdhunters perpective, from what I have seen. I'm not a buyer, today, Larry.
Good luck if you are shopping, Mr. Brown.
Best,
Ted 
Not shopping, Ted.  Just thought those 3 in particular were interesting.