Andy,
there are quite a lot of online "Breitling History" articles but none that covers all the aspects and periods of vintage Breitlings. A good resource for the other important vintage line, the historic Chronomat is here:
http://forums.watchuseek.com/f39/breitl ... -9103.htmlBrowsing this subforum will show you many examples - excellent, good and franken/fake; here you can find some vintage brochures that should give you a good overview of the late 60s/early70s:
http://www.breitlingsource.com/books_1969.shtmlhttp://www.breitlingsource.com/books_70s.shtmlIf you want to read about Breitling and see the most complete listing of Breitling models, the - imperfect - book by Benno Richter is the resource most of us use:
http://www.amazon.com/Breitling-History ... 105&sr=8-1Have fun (and try not to get addicted)