Interesting. The Darne name seems there on the lever although the photo is not sharp, and the flats have Canons Darne stamped. But, the punch marks are not the round stamps with Darne in them that we all know and love. 12 gauge with 2-1/2 (6.5 cm) chambers and two St. Etienne proof stamps. Can't make out the forwardmost stamp on the left barrel. Yes, check out the inside of the barrels before condemning it to wall hanging, although the pits, if they continue that deep all along the outside of the barrels would condemn it...
Regards
