Vintage Seiko Ladies' Mechanical Wristwatch.
Model/Case Number: 2104-7050
The first four digits (2104) refer to the movement (calibre).
The last four digits (7050) refer to the case design.
Movement (Calibre): Seiko Calibre 2104
This is a mechanical, manual-winding movement, meaning you have to wind the crown daily to keep the watch running.
It has 17 Jewels, which are synthetic rubies used in the movement to reduce friction and wear on critical components. The movement itself beats at a rate of 19,800 vibrations per hour (bph).
The "Japan-B" marking on the case back confirms it was made in Japan.
Aesthetics (Design):
Case: It features a distinct, angular, and faceted case design, which is highly characteristic of the late 1960s to the 1970s. This design era often featured bold, geometric shapes. The case appears to be stainless steel, as indicated on the case back.
Dial: The dial is a light colour (likely silver or white) with a subtle, textured pattern, sometimes referred to as a "sunburst" or "cross-hair" pattern. It has simple applied baton or square hour markers.
Crown: A small, unsigned crown at the 3 o'clock position.
Bracelet: It is fitted with an integrated-style metal bracelet (likely stainless steel) with brushed finished links, matching the style of the case.
The serial number on the case back, 271532, helps to determine the watch's production date:
First Digit ('2'): Indicates the year the watch was made, which is a year ending in 2.
Second Digit ('7'): Indicates the month it was made, with '1' being January, '2' being February, and so on (7 = July).
The movement (Calibre 2104) and the overall aesthetic suggest this model was most likely produced in the 1970s (which aligns with the case design and the vintage status of this calibre).
Therefore, your watch was manufactured in July of 1972.
This watch comes from a significant era in Seiko's history:
The Late 1960s and 1970s: This period was a peak for Japanese watchmaking, even as the "Quartz Crisis" was beginning. Seiko was a powerhouse, producing a vast array of high-quality mechanical watches before fully transitioning to quartz.
Mechanical Ladies' Watches: While less commonly discussed than the men's mechanical models of the time (like the King Seiko or Grand Seiko), this watch represents Seiko's efforts to provide reliable, high-jewel-count manual-winding movements for women, often in smaller, dressier, and more fashionable cases.
Design Trend: The bold, geometric case shape and integrated bracelet are classic hallmarks of 1970s watch design, a time when watches were seen as stylish accessories, often mirroring the Art Deco revival trends of the era.