Omega Speedmaster 25 mm is the reference in this note. Read the dial as a printed part, not as a logo. Indices should share one height and one alignment. A marker that leans, or a print edge that feathers, is damage or a later dial. The minute track should meet itself at 12 without a step. Hands should match each other in finish. A seconds hand in a different color from the other two can be a design, so check it against the reference you wrote down rather than against taste. Lume plots, when they exist, should sit inside their markers. A plot that has crumbled is age. A plot that is a different color from its neighbors may be a later repair. Turn the crown one full turn out and back. It should thread smoothly. Grit in the crown tube is a service issue you can feel. None of this is a grade and none of it is a promise about a movement workshop. It is a list you can repeat on the next watch of the same reference.
How it differs
Omega Speedmaster 25 mm carries chronograph pushers. Press each pusher with the same finger and write whether the tension matches. The reset should park the chronograph hand at 12, or you should say how far off it sits. Subdials should be level in their recesses. People change pushers, hands, and bezels on chronographs. Compare the wear on the pusher ends with the wear on the lugs before you decide the whole watch has one age.
What to check on a used piece
What to check on a used Omega Speedmaster 25 mm starts with the engraving. Measure the case. Listings often say 25 mm, and the ruler is the check. Then check end-link play, clasp fold, and whether the hands pass each other. There is no price in this note.
Common mods
Common changes on a used chronograph are a replaced hand, a pusher that was swapped, and a bezel that was polished. The subdial layout should still match the reference. If a pusher color does not match its twin, say so.
What people change
On the Omega Speedmaster 25 mm, people change the bracelet, the case, or the movement.
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