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The reference 6263 was introduced alongside the 6265 in 1972 and remained in production until 1988. These references feature the important innovation of screw-down chronograph pushers, first tested experimentally on the 6240. Together with the 7 mm Triplock crown, they ensure enhanced water resistance.

The 6263 replaced the 6264, from which it inherited the black acrylic bezel insert with white tachymeter scale, distinguishing it from the 6265, which features an engraved metal bezel.

The example shown here comes in the striking 18k yellow-gold configuration with a champagne dial and contrasting black sub-registers. It is paired with a riveted Oyster bracelet with 71 end links. From the mid-1970s onward, gold versions were the only Daytonas to receive Chronometer certification, as indicated by the “Superlative Chronometer Officially Certified” text at 12 o’clock.

It is powered by the Caliber 727, introduced in 1969.

This particular watch stands out for its excellent overall condition and the presence of a beautifully aged, naturally oxidized case that adds exceptional character.

The 6239 is the very first true Rolex Daytona reference, introduced in 1963 and produced concurrently with its predecessor, the 6238. It remained in production until 1969.
It marked a major evolution in the line by introducing, for the first time, the engraved tachymeter bezel, which helped create a cleaner and more balanced dial layout.

The reference was offered in stainless steel as well as 14k and 18k yellow gold (as with the present example). Gold models were fitted with two dial configurations: champagne with black registers or black with champagne registers, as seen here.
The “Daytona” wording on the dial was introduced only in 1965, appearing either at 12 o’clock or 6 o’clock without a strict pattern.

The watch is powered by the Caliber 722-1, which replaced the earlier Valjoux-based 72B movement.

What makes this particular example stand out is its remarkably well-preserved condition: entirely untouched and never restored, yet showing exceptional overall integrity, complemented by a subtle and charming natural oxidation on the case.

The reference 6238 is one of the most iconic Rolex chronographs ever produced. Introduced in 1961 and manufactured until 1967, it represents the final pre-Daytona reference—although for a short period it was produced alongside the early Daytona models. Total production is estimated at around 3,700 pieces, of which approximately 4000 were made in stainless steel, 225 in 14k yellow gold, and just 150 in 18k yellow gold, as in the present example.

Its key defining features include Oyster case, 600-series pump pushers, Oyster Twinlock crown, smooth bezel in matching metal, domed plexiglass crystal and printed tachymeter scale on the dial. Except for the printed scale—later transferred to the bezel—these are the same traits that would go on to define the very first Daytona.

This particular watch belongs to the third series, identified by serial numbers above one million, whose dials were either silver (as on this example) or, more rarely, black. The silver variant could appear in either a lighter tone—like the present example—or in a slightly darker shade. Dating to 1966, it falls right within the period when the 6238 was being produced concurrently with the earliest Daytona references.

It is powered by the caliber 722 movement, introduced in 1965 to replace the earlier Valjoux 72B—a robust, reliable, and historically important manual-wind caliber.

What truly sets this example apart is its remarkable state of preservation. The case, dial, and overall presence remain exceptionally well maintained, making it an extraordinary specimen of one of Rolex’s most significant transitional chronographs.

Alain Silberstein began his career as an architect and interior designer, and has always been deeply passionate about art — a background that clearly shines through in all his creations. His brand was launched in 1987 at the Basel Fair, making him one of the very first truly independent watchmakers in the modern era. His timepieces are instantly recognizable, featuring artistic influences of remarkable depth: shapes and colors inspired by Piet Mondrian, Kandinsky, and Miró; case aesthetics drawn from the Bauhaus movement; and a visual language reminiscent of Keith Haring’s pop art. All of this is paired with high-quality, reliable movements.

The watch shown here perfectly embodies the distinctive aesthetic of Alain Silberstein, defined by vibrant colors, bold geometric shapes, and a playful, artistic approach to design. The MK401B reference, part of the Marine Krono line, is a titanium chronograph with a strong presence, featuring a substantial 45 mm case.

Produced in a limited edition of 999 pieces, this model features a black dial enlivened by a yellow peripheral calendar and a lively combination of shapes and colors, all reflecting Silberstein’s unique reinterpretation of the Bauhaus movement. The chronograph pushers, also colored and lacquered, add an additional touch of personality. The watch is completed by a rubber strap, underscoring its sporty and contemporary character.Powering the watch is the Valjoux 7751 caliber, appreciated for its reliability and mechanical complexity.

Ebel is a historic brand founded in 1911, but it gained particular cultural significance under the leadership of Pierre-Alain Blum, from the late 1970s through the 1990s. During that period, while the watch industry was facing the quartz crisis, Ebel managed to stand out by introducing innovative models with significant impact. Among these, the introduction of the perpetual calendar in 1984 stands out, at a time when many Swiss brands were focusing on much simpler complications and Patek Philippe had not yet launched the famous 3970.

The watch presented is an Ebel Perpetual Calendar based on the El Primero caliber, reference 3136901. It is crafted in white gold — a limited production version — with a 40 mm case featuring the emblematic five screws on the bezel. The dial is white with Roman numerals, elegant and perfectly balanced in its perpetual calendar indications. The watch is completed by its original Ebel bracelet, also in white gold, an element that enhances its rarity, aesthetic coherence, and collectible value.