*The item is in working condition, but the operating time has not been measured.

■ Condition of scratches and dirt
Crystal: Minor
Case back: Minor
Bezel: Moderate
Strap: New aftermarket part
Calendar:

Overview and Historical Position of the Crown Series

First, let's look at the historical background of Seiko's "Crown" series.

Within Seiko's wristwatch lineup, the "Crown" was positioned as a mid-to-high-end model, succeeding the Marvel series. It falls within the progression of grade improvement: "Marvel → Crown → King / Grand."

Seiko Museum's historical timeline also states that the Crown appeared in 1959 as the successor to the Marvel.

The Crown also served as the technical and design platform that formed the foundation for the later Grand Seiko. It is sometimes mentioned in the context of "models that further improved accuracy by leveraging the know-how of the Crown."

Some sources indicate that higher-specification models such as "Crown Special" also existed as derivatives within the Crown lineage.

Against this backdrop, the Ref. 15002 series is likely positioned as a "manual-wind dress watch" within the Crown series.

About Ref. 15002 (including 15002E)
Specifications and Features (to the best of our knowledge)

Here are some specifications and features gathered from auction information, watch sales sites, and repair blogs.

Item | Information
------- | --------
Model Number | 15002E (models with the "E" suffix)
Manufacturing Period | Early 1960s. For example, a 1960 model has been confirmed.
Movement | Manual-wind movement, with models equipped with the Caliber 560 series observed.
Jewel Count | Some models are listed with a specification of 21 jewels.
Case Dimensions and Specifications | According to auction information, the case width (including crown) of the 15002E is approximately 37 mm, and the thickness is 10.2 mm. Some models are specified as GP (gold plated) material.
Exterior and Dial | Variations with a black dial or a silver-toned (satin/lacquer finish) dial are observed.
Sweet Road | Vintage Watch Sales and Repair Specialty Store

Condition and Number of Existing Units | Unused items and those in good storage condition are also in circulation and can be found at auctions.

The Ref. 15002 is believed to belong to the relatively older manual-wind models within the Crown series.

Many Crown series models are considered foundational in the accumulation of technology that led to Seiko's progression into high-end watches, such as Crown → Crown Special → Grand Seiko.

The actual condition of the watch (dial, hands, case, movement preservation) and the originality of parts significantly influence its appraisal and price. Particularly, the plating deterioration of gold-plated (GP) cases, the condition of the crown, and refinishing history of the crystal and hands are parts that are prone to deterioration or alteration.

There are few systematic documents or catalog entries for the specific model name "15002E"; it appears to be a specification variant with the "E" suffix as a derivative of the "15002" series.