Is it possible to tell from a singe up-front picture if its a pre-moon (any) 321 or a 861 caliber speedmaster? (the watch comes with a nato strap) the big seahorse is definately on the back, its a non-don bezel
Yes it is. If the dial doesn't have a raised emblem (as this dial appears not to but photo is poor), the reference is a 145.022-69 with an 861 movement. If the seahorse is on the back, it is also premoon.
Now you have not done your home work! www.speedmaster101.com The short answer is yes, I can tell this should be an 861 unless it has a (rare) service dial The size of the pushers mean it has to be 816, or if 321 with service dial, a 145.012. It is most likely to be a 145.022-69 by a long shot