The post on the left is suitable to the Triomphe and Victory groups - both as introduced and in the later Triomphe S3 and Victory S3 incarnations - plus 1987-1990/1 Chorus, Athena, and Croce D'Aune.
The right post is applicable to 1991/2 Chorus RS and 1993-1994 Chorus.
There is absolutely no functional difference between either of these posts; the only difference is the engraved ring and step below the tapered aero section of each post. Both are roughly equal in Campagnolo's overall hierarchy. Similar posts include C-Record ("Record" after 1991), which used the same bolt mounting as Super Record; and Athena/Athena RS, which is identical to Chorus with exception to a much larger upper rail clamp. Neither are shown in the above photographs.
-Kurt
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Last edited by cudak888; 04-12-11 at 09:04 PM.