These Campagnolo chainring bolts are the first 3 versions. Note that in row #1, (c.1958-1962) the stamped words are very smooth, as is the inner and outer edges of the face of the bolt face. I believe that more polishing was done to the bolt face after stamping, and before chroming. The first row style appeared in both chrome-plated and zinc-plated. Row #2, (c. 1963-1972) shows the same, early oval "0" as in the first row bolts, but the words appear a little larger because there's more displaced metal at the edges of each letter which indicates less polishing. I think that row #3 might be later yet, (?) with even more displaced metal at the letters. 

Row #4, (c. 1973-1978) retains the word "PATENT", but has the later, round, "O". Row #5, (c. 1979-1984, and beyond?) is a later version that has the word, "BREV." replacing "PATENT".

Rows 2 and 3 could be the same version?

This is a Cinelli headbadge from the era ca. 1958 - 1971. Its tall dimension is 51mm. Note that the non-painted areas are silver plated which has taken on some light tarnish, (oxidization). Silver oxidization gets blacker with time. Headbadges and stem badges from about 1972-1977 were all aluminum.

This is a Cinelli stem badge from the same era. 

The back side of the stem badge shown previously does not show any silver plate, (?) Also, note that some of the image from the front can be seen on the back, such as the diagonal, "CINELLI" and the curved bottom of the crest. This indicates that the raised part of the image was created by stamping rather than an acid edge process. i.e., the parts of the image from the front that were under the greatest pressure from the die, showed metal flow on the back.

This headbadge from a ca. 1954 Model S.C. pista is larger (56mm) than other headbadges. The silver plating has significant black oxidization. 

The stem badge from this ca. 1954 track bike shows both the snake and the lily next to it in brass, i.e. raised rather than relieved to accept paint. This headbadge shows a very dark blue background which is a badge variation from the early 50's. The absence of silver plating suggests that some brass badges were not silver plated, or the silver plate was polished off by the owner at some point.

The back side of this Cinelli headbadge shows silver plate as well as the original owner's name and address in German.

This a from a 60's era Danish Schroder track bike.

This 1966 Model S.C. track bike has been restored and both brass badges were polished, which removed the tarnish along with the silver plating. 

This very old and very rare Cinelli stem badge has a blue background, and is a true "cloisonné" enameled badge. Each color is made from powdered, melted colored glass. 

This is a headbadge from an early Cinelli model Riviera. This bike was spaced in the rear at 100mm. 

This Riviera headbadge is riveted on.

This is a NOS Cinelli chromed steel track stem with aluminum badge. The aluminum badges were used in the latest badge period from about 1972 until the company was sold the Columbo Family in about 1977, or 1978. The Columbo's were known for their Columbus steel bicycle tubes.