Breguet 401165 is the reference in this note. Start with the case in your hand, not with a listing photo. Turn the watch over and read every engraving before you look at the advertisement. A reference names one case and one dial. Write that reference down, then measure across the bezel and from lug to lug. Those two measurements answer different questions. One is the width people quote. The other is how the watch sits on a wrist. Look at the lugs where they meet the bracelet or the strap. A gap you can rock with a fingernail means the end piece or the spring bar has been changed. Open the clasp and look at the inner fold for wear and for a stamping that does not match the case. The crystal should meet the bezel in an even lip. Chips hide at that lip. The hands should pass one another without rubbing, and the seconds hand should sit above the minute track rather than dive into it. If a date window is present, cycle it and watch the disk sit level. None of these checks require a story about where the watch was cased. They require the watch itself, a ruler, and a few minutes of attention at a desk.
How it differs
Breguet 401165 should be checked as one case, one dial, and one bracelet or strap. Measure the width and the lug-to-lug distance. Read the engraving. Then see which part looks newer than the others. People change crystals, inserts, clasps, and straps. The case is the part that should still match the reference you wrote down.
What to check on a used piece
What to check on a used Breguet 401165 starts with the engraving. The reference to read is 401165. 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 are the strap or bracelet, the crystal, the clasp, and sometimes the hands. Write which of those looks newer than the case. Leave the reference name tied to the engraving.
What people change
On the Breguet 401165, people change the bracelet, the case, or the movement.
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