The F.P.Journe Chronometre Bleu reference CB-1304-TA-39mm is a 39mm luxury timepiece distinguished by its use of tantalum for the case, crown, and buckle. Tantalum is a rare, dense, and highly corrosion-resistant metal with a dark grey-blue hue that is exceptionally difficult to machine due to its high melting point and hardness. The watch features a slim profile with a thickness of approximately 8.3mm to 8.6mm and a lug-to-lug design that emphasizes comfort. Its mirror-finished chrome blue dial is achieved through the application of multiple layers of blue lacquer, hand-polished to create an effect that shifts from deep black to vibrant blue depending on the light. The dial is completed with cream-colored printed Arabic numerals and a guilloche small-seconds sub-dial located between the 7 and 8 o’clock positions.

The watch is powered by the in-house Calibre 1304, a manual-winding movement constructed almost entirely from 18k rose gold. This movement utilizes a twin-barrel configuration in parallel to ensure a stable delivery of torque, providing a power reserve of approximately 56 hours. A notable technical feature is the hidden gear train, where the wheels run beneath the dial to create an uncluttered aesthetic when viewed through the sapphire crystal caseback. The movement is finished with traditional haute horlogerie techniques, including barleycorn guilloche on the base plate, Geneva stripes on the bridges, and polished chamfered angles. While highly precise, the movement notably lacks a hacking seconds feature.

General reviews of the Chronometre Bleu frequently highlight its exceptional versatility, noting that it functions effectively as both a dress and casual watch. Critics and enthusiasts alike praise the unique weight and luster of the tantalum case combined with the depth of the lacquered dial. It is often cited as a masterpiece of independent watchmaking for its uncompromising use of precious materials in the movement and its distinct design language. However, some reviews mention the relatively small crown as a minor tactile drawback for winding, and the current market context often focuses on its extreme scarcity and high secondary market value compared to its original position as an entry-level model for the brand.