OD, no, the rib on my F Grade #10,807 is not like the rib you picture. The pattern is a ribbon with well defined, cut side borders, with the engraved center ribbon occupying about seven eighths of the rib width. The engraved portion, probably done with a mill of some kind, consists of eighth inch sections of engraved straight lines running lengthwise alternating with very much more lightly engraved areas slightly less than an eighth of an inch. The slightly under one quarter inch patterns alternate for the full length of the rib. Although done with some kind of mill or set of cutters, they appear hand done and are beautiful. I don't know when the flat turned rib was introduced, but the pattern on 10,807 must be a transition from smooth concave ribs to the full turned rib. It is the only one like it I have seen, but then I haven't seen a lot of Lefevers. The pictured gun is the only other concave rib I have seen with a pattern cut into it. Murphy
