• The lock nut on the Campagnolo hub axle typically is stamped with "CAM. 60" or some other number denoting the last two digits of the year of manufacture.
• Nuovo Record and Super Record rear derailleurs have a patent date that corresponds to its manufacturing date starting in 1970 (example "PAT. 70") and marked "PATENT" without a date before 1970.
• Campagnolo crank arms have a date code starting in 1973, consisting of a diamond (1970's) or circle (1980's) with a number in the center denoting the last digit of the year of manufacture, and then in 1985-9 with square and number in the center: 11 = 1985, 21 = 1986, 31 = 1987, 41 = 1988, 51 = 1989 plus some other examples.

• gm7025/eBay
• Gary Little
• Lance

Low end Olmo as imported in the late '50's and 60's into the '70's. Straight gauge tubing, Stamped dropouts. 27" Italian clincher rims, steel earlier, alloy later, Nisi or Fiamme rims. Inexpensive steel hubs, some are the Italian Simplex hubs, quick release skewers later, wingnuts earlier in the '60's, possibly into the 1950's also. Steel cottered Olmo/ Magistroni type swaged crankset. Chainrings usually 47/50. Italian Sheffield sprint pedals, with toe clips and straps. Saddle was low end Aquila leather. Campagnolo Gran Sport derailleurs with downtube shifters. Earlier models had a rod front shifter, later ones had a box type push rod Gran Sport front derailleur. Four, then five speed freewheel. Usually Universal brakes, side pull first, then '61's. Ambrosio bar and stem. Straight steel post, Came with fenders. Bikes were mostly in metallic red, blue, and gold. Retailed for about $89.95. [composite of Ted Ernst remarks on CR]

Swallow rondine lugs; Campagnolo forged dropouts with Campagnolo Sport derailleur pivot spring hole, chrome head lugs, chrome fork crown and fork and stay ends, chrome panel on seat tube, Campagnolo Gran Sport derailleurs and shifters, Olmo or Magistroni three pin cottered crank-set, Sheffield pedals, Campagnolo high flange hubs with straight quick release levers with Nisi rims, Mafac brakes, Ambrosio Champion stem, Olmo headset and seat post collar

The next model up [from bottom/low], a semi-pro, straight gauge tubing, had lighter weight tubing, forged Campagnolo ends, had sewups, Blue label Fiamme rims, Campagnolo high flange hubs with quick release skewers, Campagnolo Gran Sport derailleurs, steel cottered Magistroni cranks, usually steel chainwheels 47/50. Retail $129.95. [composite of Ted Ernst remarks on CR]

"Best model was full Campagnolo as extant during those years upgraded as equipment introduced. Red label Fiamme sewup rims, high flange Campagnolo hubs , earlier ones racing Magistroni cranks, alloy chainrings, Campagnolo Gran Sport derailleurs, Brooks saddle, alloy Ambrosio bar and adjustable stem, double butted Falck tubing, forged Campagnolo dropouts, Started at $169.95. When Campagnolo cranks were on the bike, the price went to $189.95. [composite of Ted Ernst comments on CR]

• Maurizio Coccia, 9 Dec 2016: "I also called to Olmo factory last monday: I spoke with mister Alessandro Baglietto; he works in Olmo since a lot of time. He confirm me: doesn't exist a register of their bike based on serial number and - today - they don't have a way to date precisely their old bikes. Code under bb it's only a progressive number."
• Chuck Schmidt's Original Campagnolo Timeline is a key resource for parts dating
• Date of Manufacture for Bicycle Components
• Certain Campagnolo parts are key for dating:
  • Nuovo Record and Super Record rear derailleurs have a patent date that corresponds to its manufacturing date starting in 1970 (example "PAT. 70"); marked "PATENT" without a date before 1970.
  • The lock nut on the Campagnolo hub axle typically is stamped with number plus sometimes more e.g. "CAM. 60" and the two digits are the year of manufacture.
  • The word "RECORD" was added to Campagnolo hub barrels around 1963.
  • The Campagnolo Gran Sport rear derailleur lost its cable housing adjuster around 1960.
  • Campagnolo crank arms have a date code starting in 1973, consisting of a diamond (1970's) or circle (1980's) with a number in the center denoting the last digit of the year of manufacture, and then in 1985-9 with square and number in the center: 11 = 1985, 21 = 1986, 31 = 1987, 41 = 1988, 51 = 1989 plus some other examples.
• Quick release levers: the original "Open C" style Campagnolo logotype on the QR levers (imagine a U turned on its side) was changed to a "closed C" in 1958 with the introduction of the one-piece alloy Record hubs, and a little later to the shift levers.
• Campagnolo rear dropouts with porta catena holes came out in 1976. Mark Winkelman's Carlsbad Masi was custom built for the original owner by Masi USA in June 1976, and the buyer specified it to have the short Campagnolo 1010B rear dropouts with porta catena holes.
• Campagnolo closed C rear dropouts
  • "My confirmed Bianchi team frame built for the 1959 season, with matching serial numbers for fork and frame, has closed 'c' on the front and open 'c' on the back, so clearly in the transition period." Doug Charles, CR
  • "My 1960 Paramount has the "Open C" dropouts.... My vote for the year of change is 1960, but sure some bikes continued to appear with them after this date until the old inventory of "Open C" dropouts was exhausted." Kevin Kruger, CR
  • "I have two frames that have the open-C on the dropouts that are datable to 1959 by serial number, and one bike that has open-C dropouts with Universal 61 brakes, so assumedly 1961-ish. Of course the stock of parts would continue onwards, so I guess the real test is the earliest appearance of the closed-C."Michael Maher, CR
• the Campagnolo Sport sprung pivot derailleur hole in the right rear dropout, which dates the frame from late 1950s to 1963 or so.
  • Harvey Sachs, CR 2007: "...It is my understanding, which could be wrong, that 1961 and earlier Campy drop-outs with gear hangers all had a raised boss ~ 5 mm wide with a rounded upper edge. This extended from the gear hanger upwards. In almost all cases, this boss was penetrated by a small hole ~ 1 mm diameter, which was the stop for the tension spring on the Campy Sport and similar derailleurs...."
  • Dale Phelps, CR 2007: "...The "boss" Harvey mentioned was actually added to a new forging around the mid-late 50's and had a hole drilled into it for the spring tang on the tension-sprung Campy Sport derailleur. It was a coupla years at least after that derailleur was introduced. After Campy quit making that derailleur in the early-mid 60's (timeline overseers please chime in for a more definitive date?), the dropout-with-hole was phased out, leaving the boss (but no hole.) Later, (late 60's?) the forging was re-done again, this time without the boss, and dropouts with "the boss" started to disappear from use by the very late 60's. I just looked at an early 60's Cinelli with "the boss" and hole, a '62 Olmo with "the boss" and the hole, a 70 Atala with "the boss" but no hole, a 71 Falcon San Remo without the boss, and a 72 Colnago with "the boss" (but no hole) so my memory of lots of other bikes is somewhat supported by examples I could actually look at tonight. ..."
  • Dropout of Peter Brueggeman's 1963 Olmo Deluxe #E864 has the hole. Dropout of Peter Brueggeman's 1972 Mondia has the boss and no hole.