Depends

Nov 25, 2020,11:45 AM
 

If you care more for it being NASA-flight qualified (and robustness that comes with that) and ‘as close to the original as possible’ then go for the 1861


If you like staring at complex movements (and this happens to be one of the prettiest) and want the clarity that comes with the sapphire crystals, then go for the 1863

You can’t go wrong with either. Please posts photos after your acquisition 

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My potential first Omega Moon watch chronograph and my first Omega.

 
 By: Watchlover78 : November 25th, 2020-11:10
Manual winding with caliber 1861,solid case back with hesalite crystal or caliber 1863 with sapphire crystal and exhibition caseback? All input is most welcomed.

Depends

 
 By: Lankysudanese : November 25th, 2020-11:45
If you care more for it being NASA-flight qualified (and robustness that comes with that) and ‘as close to the original as possible’ then go for the 1861 If you like staring at complex movements (and this happens to be one of the prettiest) and want the c... 

Sapphire front and back for me

 
 By: India Whiskey Charlie : November 25th, 2020-12:41
It's a beautiful movement to look at.

I would go for the

 
 By: myles721 : November 25th, 2020-12:47
1863

1861 solid case back, plexiglass

 
 By: mahesh : November 25th, 2020-14:09
quite a value

I like to be a little different so that’s why I go for their FOIS

 
 By: Clueless_Collector : November 25th, 2020-14:44
First Omega In Space

There's one recent Speedmaster that offers . . .

 
 By: Dr No : November 25th, 2020-22:05
. . . the highlights of both versions: ref 3572.50 with hesalite crystal and sapphire back showcasing a cal 1863 movement. [Andrew's ref 3572.50, 2013] Our Andrew had one, as did at least one other member of this community. They're not overly difficult to...