Santini fluted frame

[Jesper]

I obtained this odd '80s frame for one of my winter projects. I am still trying to research it due to the name (unknown marque to me) and tubing. It utilizes "Gilco like" fluting; but 5 flutes instead of 4 as found on "Gilco" tubing used on Colnago Masters and other bikes. I think the frame tubing (3 main tubes at least) are Columbus; but probably modified outside of their factory as I have recently found out that Rossin made their own shaped tubing (I have a Rossin frame made with 4 flute Columbus "CROMOR"). The fork is full Columbus (steerer-reinforced, blades, and drop-outs); and rear drop-outs are also Columbus. Panto'd stay caps and head lug. Lugs are Prugnat. I have never seen a BB shell of this design; there is a casting mark that appears to be "SR" (it is not "Sakae Ringyo") in a circle; my research shows it being used on dozens of high quality Italian frames, and English frames even Raleigh. It would seem to have appeared in the mid to late 80s and was gone sometime in the 90s.
Italian thread BB @ 70mm, 125mm rear fork, seat post 27.2mm, internal shift and brake cables, top mount DT shifters.

The Santini bikes I have seen have a 4 leaf clover logo (see last photo); from a shop in Forte dei Marmi founded by Ermanno Santini, but I believe there is no connection other than name. Decal font is also different between the 2 marques.

[GirishH]

Jesper, what a beautiful frame. Just curious how you know so much about a frame. I can't write so much about my full bike..:-) So, wondering if you worked in the bicycle industry or if all this is out of pure passion. Please keep us posted on how the bike comes along.

[Jesper]

I am ReapThaWimpWind and I view the world from a plexiglass window in my lower abdomen because my head is a sigmoidoscope always shoved up my.... Content deleted due to lack of integrity by the submitter. All existing photos are AI generated and photoshopped for inaccuracy.

[Painkiller]

This is the reason I love you Jesper. you are a "national treasure" in the bicycle world. You have my deepest respect and I really appreciate the time you take doing what you do for this site.

[Jesper]

I am ReapThaWimpWind and I view the world from a plexiglass window in my lower abdomen because my head is a sigmoidoscope always shoved up my.... Content deleted due to lack of integrity by the submitter. All existing photos are AI generated and photoshopped for inaccuracy.

[enkei]

That's a lovely frame. I hope you discover its heritage.