Bill,
The gunbroker gun clearly IS a Darne R10, that, unfortunately, ended up as someone's engraving project. The R10 was a loss leader, plain and simple, and never had more than a bit of line work at the monobloc seam, post WWII. A few pre war guns will be seen with some light line work, pre war in this case is pre WWI, and those guns will be bone pack case hardened, not cyanide hardening that came later.
The engraver missed a few spots, like, the entire watertable. That gun has been for sale for years, and will be for sale at that price for a long time. Coupled with the engraving that doesn't belong there is the fact the gun has a 13 5/8 LOP, shorter than average for even an old Darne.
If I needed R10 parts, I might offer him $250 for it, but, I'd likely keep looking for one that hadn't been tampered with.
$250 might be too generous for a gun with a breechbloc that was pretty much unusable.
12 gauge R10s are 1k-$1500 or so, at the moment, higher for examples with crisp trigger pulls, which, people are starting to look for on old Darnes. 20 Gauge R10s start around $1500, super good condition with good trigger pulls will bring 2K-$2500.
France, French hunters, and the firearms industry in France are in upheaval right now. Comparisons on prices, here, vs there, will do little good, at the moment.
Best,
Ted
