sorry to be so late onto this thread, Nilo.
In terms of the fact that the large cases have two holes, I can not really give a clear answer. This case was used for both the automatic
chronograph - which has the crown on the left - and the manual wind version which has the crown on the other side. It might simply
be a case of Breitling being economical in their production and having one case made that could be adapted for either movement!
The case itself is really very unique and a marvel of engineering, as Breitling searched for a way to provide a waterprrof case with their
trademark rotating sliderule. Here is a nice breakdown of it that gives a sense of it's complexity.
The vintage watches you show all use the cal 11 or 12 automatic movement. The GMT is perhaps the rarest of them, a really striking design and one I would
love to add someday to my own collection.
The smaller white dial chron-matic also has a very interesting dial, as it sports the wings of the AOPA. Which is very unusual at this late date, it may well mean
that this watch was sold through the AOPA to it's members as a special edition for them.
One final thought is that these big cases do wear very weel and are still really a good deal on the vintage market.
All I can say so far is WOWOWOW on your friends deep, thoughtful and lovely collection.
This message has been edited by Ubik on 2012-11-22 06:21:29