Nice collection of Heuer's and you are obviously an enthusiast so may I bid you a belated welcome. One thing may help us is the serial numbers and model numbers on the Autavia's. The manual wind two register has a very specific and unusual model number and movement for that matter so it would be interesting to see how yours compare. If you do not already know these can be found between the lugs. They may also help in dating the watches and resolving the conflict between the markings on the Automatic Autavia and the 510 Lemania's.
Look forward to your reply
regards
Paul
www.heuerworld.com