Seiko Lassale Ultra-Thin Quartz Ref. 2F50-5919 - June 1987
Some watches convey their slimness merely through their side profile; the Seiko Lassale 2F50-5919, however, builds its entire design around this concept. The rectangular case approximately 20.5 mm wide connects to the two-tone integrated bracelet not like a separate watch body, but rather like an elegant, seamless extension. The result is less a classic dress watch and more a slender design object that sits perfectly on the wrist.
**IMPORTANT NOTE: As this item ships from within the European Union, you will not be liable for customs duties within the EU.**
The engineering driving this aesthetic is the Seiko Calibre 2F50. This 12-jewel analog quartz movement measures just 1.3 mm in height. Here, quartz technology serves not only to ensure precision but also to redefine the watch's physical proportions. Thanks to such a slim movement, the case maintains a low profile; the Lassale’s elegance is a direct result of this technical miniaturization.
The dial reflects this engineering with understated restraint. Against a light-colored surface, one finds only slender gold-tone baton indices, two elegant hands, and the inscriptions "LASSALE" and "QUARTZ." There is no second hand, no date display, and no superfluous indicators. In contrast, the bracelet offers a much more dynamic look, featuring a repeating pattern of small steel and gold-tone links that extend right up to the case. This creates the watch's most striking visual contrast: the dial is supremely minimalist, while the bracelet is intricate—almost like a piece of jewelry.
Thanks to the integrated construction, there is no distinct break between the case and the bracelet. The two-tone links extend the geometry of the case, giving the watch the appearance of a seamless, single-piece design. The Lassale’s jewelry-watch character stems from this sense of proportion and cohesion rather than from oversized logos or ostentatious materials.
The blue factory sticker on the case back remains intact today. The label displays the reference number 2F50-5919 and production details indicating a stainless steel case back paired with a base-metal mid-case and bezel. The serial number 760134 at the bottom dates this specific piece to June 1987, according to Seiko’s classic dating system. In period records, this reference also corresponds to the model code LBMA012.
The condition of this piece is also significant to the model's character. The protective film on the case back remains preserved, while the dial, case, and two-tone bracelet largely retain their pristine appearance. This level of preservation is particularly remarkable considering how quickly such slim, polished, and decorative surfaces tend to accumulate marks during daily wear.
Final Thoughts
The true luxury of the Lassale 2F50-5919 lies not in a claim of exotic materials, but in engineering measured in millimeters. In this June 1987 example, a movement measuring approximately 1.3 mm, a serene white dial, and a jewelry-like, two-tone integrated bracelet come together; it clearly demonstrates how Seiko utilized quartz technology to create watches that were not only more precise but also physically more elegant.
The product shown was manufactured in 1987.
It has undergone professional maintenance and servicing.
The movement was completely disassembled; Each part has been cleaned, lubricated, and precisely adjusted to ensure flawless operation. (It requires no maintenance for three years, provided it is not exposed to adverse conditions.)
Product Condition: Tested; all functions are fully operational.
