Thanks folks, for the comments and replies to my question on the Adolph Springfield rifle "comb flute".
I was referring to the M1903 Springfield pic posted my Michael Petrov 21 Dec at 02:56PM.
Yeti: the "comb flute" on my H&R SxS 10GA Damascus is virtually identical to the Adolph rendition as seen in Mike Petrov's pic. I'm very taken with it, as it strikes me as so "neat" and understated. This paticular little feature seems to have fallen out of use in the early 20th century - otherwise we would have more examples and at least one or two "collector" names for it. There was probably a word for it "back then", similar in vintage to the collector's term "widow's peak".
Thanks for the input.