Frederique Constant

Classics Index Automatic

Ref. FC-303NN5B6B

Case diameter: 40 mm; Manufacturer spec
Lug-to-lug: —; Not published
Thickness: 10.3 mm; Manufacturer spec
Lug width: 20 mm; Manufacturer spec

Retail price $1,695 (US, Oct 2026)

We have not verified this watch’s lug-to-lug yet, so we can’t draw it on a wrist. Case diameter alone is a poor guide to fit.

How the Classics Index Automatic wears

At 10.3 mm thick it is thicker than 52% of the 147 other dress watches we've measured, so expect it to sit tall on the wrist.

Its 20 mm lug width is one of the most common strap sizes; 196 other watches here share it, so aftermarket straps are easy to find.

Specifications

Reference: FC-303NN5B6B
Collection: Classics
Status: In production
Case material: stainless steel
Crystal: sapphire
Water resistance: 50 m
Dial: blue
Strap / bracelet: stainless steel bracelet, deployant clasp with push buttons
Style: Dress, Everyday

Movement

Caliber: Frederique Constant FC-303
Type: automatic
Power reserve: 38 hours
Frequency: 28,800 vph (4 Hz)
Jewels: 26

Takes 20 mm straps. See other 20 mm watches and straps.

Same 20 mm lug width

All 20 mm watches

These take the same straps as the Classics Index Automatic.

Sources