Dr No[Moderator Omega - Wristscan]
34923
There were roughly a hundred thousand cal 50x chronometer movements produced . . .
Apr 27, 2019,11:56 AM
. . . between cal 501, 505, and 504 (calendar). Cal 501 chronometers were issued the first year ('56), with cal 505 made between '57 and '59. Most cal 501 movements were not chronometers, but a portion were certified for use in Constellations. All cal 504 and 505 movements are chronometers, the vast majority going to the Constellation line. (All cal 504 movements are, to the best of my knowledge, used in Connies.) Supposedly there were five cal 501/505 movements made for every cal 504, but I find that difficult to reconcile with a disparity of more like twenty-to-one on the secondary market today.
I've never seen a Seamaster chronomètre issued with a cal 501 movement. Or a cal 504, for that matter. Never seen one in rose gold in any configuration - solid, capped, or two-tone. And never any dial color other than white. That said, I've only seen a score altogether, so there may well be variations I'm unaware of.
For all the affection second generation Connies have garnered, it's remarkable how few collectors have focused on the scarcer Seamasters. The only one I've ever seen in the metal is on my wrist . . .
. . . as I write these lines.
Warmest,
Art