This one, "just about any Mareographe" on your list is now attainable:

https://www.sothebys.com/en/buy/auction/2020/watches-online-3/heuer-reference-2444-mareographe-a-stainless-steel

;-)

: Most readers have realized that I have not included the
: "unattainable" in my posting, but I have received a
: few messages asking why I didn't include watches like the
: Seafarer in the Reference 2446 screw-back case. And that's where
: the "attainable" / "unattainable"
: distinction comes into play. My criteria for a model to be
: included in the posting is whether the diligent collector could
: reasonably hope to find one for sale in a year or two of
: searching.

: So the list of the "unattainable" is long, but fun to
: ponder. The following would be a few among the
: "unattainable": Seafarer in Reference 2446 screw-back
: case (and for that matter, the very first Seafarer, in the 346
: case) just about any Mareographe the Lemania 5100 powered
: "Boxing" chronograph [two seen] Lemania 5100 powered
: in 18 karat gold anything with a test / prototype dial (we have
: seen test dials for the Caliber 12 Autavia and Monaco)
: Chronomatic Carrera in 18 karat gold, Ref 1158 [three seen] the
: three Chronomatic chronographs used on the first posters /
: advertisements triple calendar moonphase chronograph The list
: goes on and on, but these are a few that quickly come to mind.

: Jeff

: ++++++++++++++++++++++++++++++++++++