30L — the hand-wound benchmark of the Flagship and Conquest

In brief

Watchmakers meet this one constantly. The 30L is among the best-known hand-wound calibres Longines made, with a power reserve a little above the average for its day and a 30 mm diameter that suited a wide spread of case sizes.

Short history

The 30L sat at the core of the hand-wound calibres Longines rolled out across several of its best-selling lines in the middle decades of the century, at a point when the firm was still committed to manual winding, before the automatic took over.

Why it matters

It turns up regularly in vintage Flagship and Conquest pieces, which makes it one of the hand-wound Longines calibres you will most often find for sale on the collectors' market.

Watches that used it

• Longines Flagship
• Longines Conquest