LeBoeuf documentation is so sorely lacking, it is difficult to know much about what/ how/ why things were done when the company was alive.
That said, is the assumption/ assertion that this decoration (engraving/ carving?) was "factory," or is was it likely after-market?
That's a model #40. Even the nicest specimens, in the wildest colors don't usually go for more than about $200-250. $1200 may be merited, but that would have to be a gut decision. How rare is rare, and how much $value does "rare, maybe (literally) unique" merit.
I have very little photographic skill, so these pictures generally don't do the pens justice, but here are a few nice LeBoeufs:
Model #40s, showing a fair bit of variation over the years:
Ringtop set (IIRC, model #50) in the original box:
Assorted mid-size pens, plus an uncommon perfume applicator:
Finally, two different models in the "tiger eye" celluloid:
Regards, greg
Ahh, I'd forgotten Greg was a Leboeufster. That's what happens with hanging out at different boards too long
OK. Well...
If we are to do the Leboeuf eye candy thing (and, yeah, I guess I started this round), I'll offer up one of the most lovely and interesting Leboeuf pens I've handled, though I do not own this one. A modest ringtop. I chose at the time not to cough up the $1200 asking price, though I'm grateful to the owner for letting me shoot it. If I were into Leboeuf as I am into Parker Vacumatic, I might have taken it.
...
regards
david