Jmsoto - the photos would definitely be useful
geo "road racing" introduced in 1980 and used for at least 15 years; Professional/Corsa, Pro/Corsa Extra, 3-Athlete/Strada models; full table in EMC 1994 catalog (grey cover, Titanal model inside)
"century" geo introduced in 1988, in serial frames used until 2003; models Century, Corsa Max/Mx Leader, Arcobaleno, Corsa Thron, Corsa 01, Corsa Extra, Strada OS , alu frames, titanium frames; your table is "century" geo
"century modified" geo introduced in 2003 for alu frames (elongated TT, no change angles), used until 2008
L4C D4691 - Corsa (Columbus SL) built in October 1992
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