Hi Hajo, nice thread and amazing run of Breitling watches!
A couple of things I wanted to add, although I don't actually own a Navitimer I research into brands and iconic watches just because I love horology and the hobby in general. Firstly if you want to include all of the Navitimers on the "vintage" line I would suggest the timeline might be from 1952-1979. Before 52 is pre navi AVI/Co-pilot series (Chronomat 786), and anything after 1979 IMO isn't regarded "vintage" Navi as the company was sold off.
So I thought it might be an interesting idea to try and list all of the references on here, i'd like other members if possible to try and add variations or references i've missed (if there is a known resource of this out there please point me in the right direction.) I know there are several dial variations of 806 I can't name but would find it interesting to hear from the guys who know this stuff. Also there is a lot of cross over between movements of the Venus178 and Valjoux72 in the early days, i'm not sure if anyone has any better fixed rules as to when and why?
806 - 1952-54 conceptual stage, Breitling lists the navi as 1952 but no refs have been found before 1954.
1954 - First release. val72 version (highly prized). AOPA dial (Aircraft Owners and Pilots Association)
1955 - Navitimer with "B" logo instead of AOPA wings/val.72
1955 - Venus178 more massly produced.
1959 - mid 60s, Breitling began replacing all black dials with siver sub dial versions.
1961 - 24 hour version released (replaced by ref 809)
1963-65 redesigned hands and dial with Twin-plane logo emblem. (no longer fitted with all black dials)
1967 - 806-36/806E versions found with Valjoux 7736 (silver subdials)
1968-73 - Lip branded versions produced
1969 - 18ct Gold version
1970-71 - Larger subdials more the norm
1975 - Gruen Navi?
809 - 1962 Navi Cosmonaute, redesigned for Scott Carpenter
816 - 1967-68 Navi venus 178. (val72 in smaller numbers ref 816-72)
1806 - 1969 Navi Chrono-matic (fried egg 48mm)
1809 - Navi Cosmonaute.
2100 - Navi Quartz 80190 Yugoslav AF.
2300 - Navi Quartz 80970 Jupiter Iran AF.
3300 - Navi Quartz 80972 New Jupiter revision. Miyota Y652
7806 - Navi early 70s. successor to 806
7808 - Navi 1973.
8806 - Navi Chrono-matic cal.11 date @ 6
Movement changes happened mid 60's Breitling chose to change the Venus 178 with a Valjoux 7740, 1969 came the cal.11.
Also OP you refer to your 7650 as a Navitimer Yachting but I can't find it referenced as a Navitimer anywhere, is it similar to the 812 sometimes referenced as Navitimers because they look similar but don't have Navitimer on the dial. Maybe you could clear this up?