Paul - Thanks for the reply and of course the great insight and info. I see not many appear eager to jump into this "muddy" water. I can see how this could turn into a spirited discussion. I actually think all the styles (1163, 73363 and 73463) are good looking pieces. I also agree with you the 1163's are Sifferts as that is what he wore as part of his being a Heuer ambassador. I guess I would call the others Autavia Panda's. I do think it's interesting the pricing that they are commanding, but I guess that is the market in general for some vintage Heuer's right now. Jeff