Bike Forums - Identify Frame

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Hi Guys , can you help me to identify this frame?
I know nothing becouse when i took it it was without any sticker , i only know the original components and the dropouts brand "gipiemme".

Here the photos.

1 https://s32.postimg.org/iprh45aqc/20141213_145657.jpg
2 https://s14.postimg.org/ej6mio40x/20160510_175355.jpg
3 https://s11.postimg.org/mbtu9te83/IMG_4042.jpg

Original parts:

Wheels: Ambrosio
Brake: Balilla
Stem: Ital Manubri
Crankset: Brand is called Omega but i don't know the model
Handlebar: Ital Manubri
Groupset: Huret

Thanks everyone for the help.

Omega, or Ofmega, which is an amalgamation of the old Ambrosio, Magistroni, etc.?

I presume it has an Italian-threaded BB, and given your location, it probably is Italian.

The thick seat tube walls indicate plain gauge carbon steel, for an entry-level frame of about Peugeot AO-8/UO-8/UE-8 quality. Since it's Italian and looks to have a well-designed frame geometry, I'll bet it rides and handles better than most bikes in its class. (We sold a few bottom-of-the-line Atala bikes when I worked at a Peugeot/Nishiki dealership in the early 1970s, and the Atalas were a pleasure to ride, compared to the same-priced Nishiki and Peugeot models.)

The octagonal fixed cup suggests shell may be threaded swiss.

When frame in bare metal were any markings found, such as on steerer or shell?

Quote:

Originally Posted by John E (Post 19097868)

Hello CrowSeph,

Rizzato is Cesare Rizzato, the company which produced Atala, Lygie and Atlantica brand cycles. They are not a manufacturer of chainsets. A Rizzato marked chainset would have been manufactured by someone else. Your chainset appears to have been manufactured by Agrati.

The bicycle's headset looks to OFMEGA brand.

Fine research locating that Atala thread. Looks like you have an identification.

Is possible to know the exact model name?
Thanks for the great job guys!

Appears model may be a mid-'70's "CORSA GS"

I'm wondering if it might be be something slightly newer and more upscale? The presence of reinforcing tangs on the fork blades and brake bridge were typically reserved for higher end models. The smaller seat tube diameter may be the result of a distorted tube. I'm also not aware of Gipiemme offering short dropouts prior to the very late 1970s.

^true but I can't judge if those are actually the short GPMs or long(er) models from the pictures and can't zoom in close to enlarge that detail. Given the nutted brakes and other frame details I'd tend to think the DOs are from the earlier-than-late '70s gen and vote that this frame may be just on that cusp.
What size is the seatpost: 26.what? Can you get it sized at a shop with a "taper gauge" rather than vernier caliper?

Perhaps the serial format and placement might be of help. Up through at least 1974 Rizzato was placing the serial on the right side of the seat tube, just below the seat lug. The first two characters indicated the year of manufacture. That area on this frame appears to be unmarked in poster's photo.

We as yet have no word as to serial placement or format.