Omega Seamaster 42 mm is the reference in this note. Use daylight if you can. Artificial light hides the difference between a faded insert and a replaced one. Hold the watch at arm length and then at reading distance. The dial should stay legible, and the hands should not disappear into the markers. On a used piece the bracelet stretches, the clasp thins at the fold, and the case back collects arcs from a desk. Those three marks are ordinary. What is not ordinary is a dial that looks new beside a bracelet that is deeply worn, or a bezel insert that is glossy beside a case that is dull. Mismatched wear means a part was swapped. Name the newer part. Then measure. Width across the bezel, lug to lug, and the space between the lugs where the strap sits. Three numbers locate the watch on a wrist better than a nickname does. Keep the nickname in your head if you like. Put the numbers and the engraving in the note.
How it differs
Omega Seamaster 42 mm is a diver-shaped case. On the wrist, check that the bezel insert sits flat, that the pip lines up with 12, and that the bracelet or strap meets the lugs without a rock. People change the insert, the clasp, and the crystal on this shape more often than they change the case itself. A unidirectional bezel should click. A bezel that freewheels needs a note, not a guess about the rest of the watch.
What to check on a used piece
What to check on a used Omega Seamaster 42 mm starts with the engraving. Measure the case. Listings often say 42 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 diver are a new bezel insert, a shortened bracelet, a different clasp, and a crystal with a fresh lip. Describe each one. Do not treat a new insert as a different reference if the case engraving is unchanged.
What people change
On the Omega Seamaster 42 mm, people change the bracelet, the case, or the movement.
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