i looked, and i looked, and i looked trying to figure it out myself and im stumped. i bought the frame and fork (not even sure if its the original fork) and pieced the rest together. its got campagnolo dropouts, and just when i was taking pictures i did notice the little logo on the brakestay that i hadn't seen before. anyways, i'm all ears.

Nice Frame. With that serial number and cutouts on the lugs someone here should be able ti ID it.

No idea what it is, but I'm diggin' it. I'd flip the handlebars upside down and add some of the chubby cork grips or chubby white Schwinn grips and it'd be perfect.

nope, it won't be me; never seen anything exactly like it. Is the stamping on the brake bridge reinforcement just a numeral "2" or is there something there that looks like the Galli logo? The serial numbering reminds me of an Italian frame I had from a very little-known maker, only because it seems like the same hand-stamping that a low-volume shop would do. The fork could be original, or just as likely a replacement (50/50), is there a serial number on the steerer? Any "rifling" in the steerer near the base? Seat post size?
Are you going to paint it, or do you live in the Mojave where naked steel never rusts? oops. too late, it's already rusting...

Get some paint on that frame!

its funny, the bars used to be flipped, and i was running cork grips but then i converted it into my around town bike and had to flip the bars back when i put the basket on; and then my cats decided to chew off my grips i got some vintagey rubber ones en route.

i threw a 27.2 seatpost in it and it seems to fit pretty well. no other markings on the frame. my cryptic drawing shows what the logo looks like on the brake bridge.

hmmm...still mysterious...RTR?? ETR??
Did we determine what the BB threading is?
Seat post points to good DB tubing, but what about the fork steerer? Rifling (indicating Columbus) or no?

i allways got confused by all the different bb splines, but this one is what i refer to in my collection as "normal". it takes my shimanos, and this miche i had laying around. not sure what the rifling means exactly, so i took my headset apart real quick and snapped a shot of the bottom of the steerer tube. hope this is what you meant...

if that's the bottom of your steerer, then yours does NOT have any rifling, so at least the fork is not Columbus. And if I understand what you say about the BB it seems you have a ISO or British BB (should measure 68mm wide, not 70mm, and BB may read 1.37" x 24 tpi). So...evidence seems to point to this frame being NOT Italian, despite the Campy dropouts.

guess this one will be a mystery then, i really do appreciate the help though

i'm stripping it down this weekend and dropping it off at the autobody shop for a couple coats of white and clear

Awesome looking bike...clean up the naked steel and clear coat it as is...if that is possible.

as much as i hate to keep unburying this, it does share alot of similarities with a good amount of the SRs i have been looking at in my searches.

Been a while, still have this bike, currently on about it's 5th rebuild since those first pics, about half of them geared and half single (no more fixed). But, figured out what the bike is finally, it always did kind of bother me not knowing. Colnago Sport, seems when they couldn't handle the demand they outsourced many of the builds.

pic of another:

https://www.flickr.com/photos/gadecykel/4504299749/

https://www.flickr.com/photos/gadecykel/4504932626/

https://www.flickr.com/photos/drnick/...n/photostream/

https://www.bikeforums.net/showthread...-Colnago-Sport