When did Campy:
- start engraving the logo on their components?
Which logo? The winged wheel? The shield? The script? AFAIK, they always have forged, cast or milled their I.D. into most of their pieces parts. The winged wheel appeared in 1943 according to velo-retro. The shield was 1983.
- start using the cursive "Campagnolo" on the components?
No clue, but velo retro dates it to the 1940's and it was registered as a trademark in 1953. A long cruise thru the Campyonly website will detail hundreds of vintage Campy items with date ranges and close up images.
- start putting the gruppo's names on their components?
I have 1972 Record stuff that is so marked and even my inexpensive 1974 Valentino components are identified as such. Not every component in a groupset is marked. Once cheapo laser marking and paint transfer replaced the much more labor intensive engraved forging dies, impression stamping dies and machine engraving...it became easier to mark up every little thing. Record and Super Record rear derailleurs used to be date marked by mechanical impression stamp. Now...a bar code tranfers that get obliterated by solvets. lubricants and waxing is all the rage...
Decalcomania and product branding also became more 'pro' and trendy among the masses also. And Borat's cousin charged less money than Luigi's cousin, so more could be done for less!
It seems it's hard to determine the vintage and the group a component belonged to, not unless you have experience with them.
Yeah. With 40 years on 99% Campy under my hat, I still fubared your caliper I.D.! I was too lazy to walk to the storage area to look at my old Victory calipers on a Gardin racer from the mid-1980's. My Victory seat post is a twin to yours, but never having used Athena-level components, I don't know if they simply adopted the Victory post or if your bike had a mixed bag of components on it.
As Alf stated, many bikes got re-arranged over the years.