Blancpain 42.5 mm automatic bezel strap: what to check on a used piece

Blancpain 42.5 mm automatic bezel strap is the subject of 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

The size written down for this record is 42.5 mm. Measure across the bezel and from lug to lug before you accept that number. The seconds hand should sweep. That is the check for an automatic watch. Wind the crown and listen for the rotor only if the case back lets you. A bezel is part of this case. Turn it if the design allows, and look for a pip that has left 12 and for an insert edge that is chipped. The strap or bracelet is a fit part. Check the lug width, the spring bars, and whether the clasp fold is worn through. People change the crystal, the clasp, and the strap more often than they change the case. Write which part looks newer.

What to check on a used piece

Read whatever engraving is on the case. Measure the width. Watch the seconds hand for a minute. Look at the end links or the strap holes. There is no price in this note, and the note does not grade the watch.

Common mods

Common changes are a new strap, a shortened bracelet, a replaced crystal, and a polished lug. Describe those changes next to the size and the movement type. The case you measured is the watch you have, even when a listing used a different width.

What people change

On the Blancpain 42.5 mm automatic bezel strap, people change the bracelet, the case, or the movement.