lenght of the polished part 182 mm
weight
seatpin only      151.8 gr
nut                     4.8 gr
bolt                  10.6 gr
upper bracket   24.2 gr(steel)
lower bracket     9.1 gr
i think its actually the 2nd version.
the first version as in catalog 17 and the tradeshows was 147 mm long
a picture of it can be seen in the november 1974 bike world magazine

This particular example probably falls in the early 80's, but I can not pin point an example of it in any of the Campagnolo catalogs as of current time.  The 1985 Catalog shows the 3rd version of this post with Brev. Campagnolo printed at the top and in a single bolt design, not in the script and double bolt as in this example.  Earlier versions had the script, but with the Sun background on it.