One super nice example after another, a really great collection you have there.
While there is no real "hard rule" for a definition of "Vintage" watches I always draw the line at the transition from Tritium to Luminova - everything with the former falls into Vintage category for me.
I agree with all the points you mentioned above - for me Vintage watches are the most rewarding category in collecting and I think it is not about the monetary aspect but hunting down very rare and unusual watches in good condition.