Sure, and as my family used to own one of the oldest publishing houses of te South of Italy, it could very well be that the addition of Cynar to the recipe could have been last minute before publication. Still the only fix date you have is 1979 and that would make it 45+ years at best

This is what the journalist/food researcher, A Marzo Magno, thought was interesting as her giving the example of Cynar provides a time frame for when she collected information about Spritz, and that was at some point between 1952 (and even faintly possibly 2 or 3 years earlier than that as Cynar was being trialled in a couple of bars in Venice and Padova before it was fully launched commercially) and that point in the 1970s when the book was ready to be published.

I’m having trouble believing that it took ordinary Venetians over 20 years to work out that they could drink Cynar in this peculiarly Veneto style.

—-ETA:
The Societ� Dante Alighieri accepted and includes Mr Marzo Magno’s research on the Spritz’s origins as part of its History of Italian Food series.
https://en.wikipedia.org/wiki/Dante_Alighieri_Society

Can anyone recommend a bacaro tour? Would like to avoid tourist traps. Would it be good to do this tour during the day and then have a proper dinner or do the bacaro tour for dinner?