Campagnolo dropouts for the Cambio Corsa derailleur set. The Cambio Corsa derailed the chain after it was loosened when the rear axle moved forward in the teeth of the dropout. Once the correct cog was selected and the chain was in place, the axle was made to move back in the teeth of the dropout until the chain tension was correct. Note that these dropouts had 17 teeth.

These Paris-Roubaix dropouts were dang similar to the Cambio Corsa dropouts shown on the left, but they had 19 teeth. 

These Campy 80/1 dealies were for a framebuilder to convert an, "old fashioned" frame without dropout hangers, (like for Cambio Corsa) to frames that could handle a "modern" derailleur.

The earliest non-toothed dropouts, as shown in the "un-numbered" Campagnolo catalog, were referred to as Gran Sport, (not yet #1010) and were marked "BREV o" which is a contraction of "BREVATTATO". On these earliest rear dropouts, the adjusters were 4mm in diameter and did not have any knurled knob on the rearmost end. Rather, they were slotted only. These adjusting bolts were later reduced to 3mm in diameter, were fitted with a knob end and at the same time, "BREVATTATO" was shortened to "BREV."

Shown is a very early and very rare, "BREV.o" front dropout.

Campy 1010 long horizontal dropouts, with eyelets. These are an earlier style with less-bulky eyelets with threaded holes that are usually off-center.

Campy 1010 long horizontal dropouts with eyelets, with a single hole for the spring on the Sport rear der. Note that the "boss" for the hole was cast in. It's not simply that a hole was drilled.

Campy 1010 long horizontal dropouts, with eyelets. These are a later style with bulkier eyelets with threaded holes that are usually well-centered.

Extraordinarily rare Campy 1010 long, horizontal dropouts with eyelets fashioned in Titanium for Pino Maroni and Cecil Behringer's "Pinbehr" titanium bike c. 1973. These titanium frames were brazed and lugged. Pino and Cecil challenged all with it's strength by riding it down a long series of stairs! It's my understanding that Campagnolo made these eyeletted and non-eyeletted titanium dropouts for them (only 25 sets made) for this purpose. 

Campy 1010/1 long horizontal dropouts that are stamped/pressed, rather than forged and machined like the 1010's and 1010/B's. 

Campy 1060 "Sport" vertical dropouts as seen on some Jack Taylors. These are stamped/pressed, like the 1010/1's.

Campy 1010/B short horizontal dropouts made in Italy. Note the machined surfaces on the front dropouts and the parallel aspect of the opening on the rears.

Campy 1010/B short horizontal dropouts made in Taiwan. Note the non-machined surfaces on the front dropouts and the non-parallel aspect of the opening on the rears. Also, there is significant extra metal, (flash) that has "squeezed-out" from the forging. This makes for extra work for the framebuilder. Also, compare the window opening with the Italian 1010/B's. Finally the tabs that get inserted into the stays must be bent inward slightly. This is not the case with other earlier versions of Campagnolo forged dropouts.

Extraordinarily rare Campy 1010/A long, horizontal dropouts without eyelets, fashioned in Titanium for Pino Maroni and Cecil Behringer's trail-blazing "Pinbehr" titanium bike c. 1973.  These titanium frames were brazed and lugged.