a vintage Citizen Eagle 7 (model series). This is a classic automatic watch that was Citizen’s answer to the Seiko 5, known for being a reliable "workhorse" timepiece.

Here are the specific details for your watch:

Watch Specifications

• Brand: Citizen

• Model Series: Eagle 7 (identifiable by the "Eagle" logo with the number 7 inside it at the 6 o'clock position).

• Movement: Citizen 8200A (Automatic). This is a 21-jewel mechanical movement that can also be hand-wound.

• Case Size: Approximately 36mm (often referred to as "Boy Size" or mid-size by modern standards, though it was the standard men's size in the 70s and 80s).

• Functions: * Day-Date: Displays both the day of the week and the date at 3 o'clock.

  • "Navi" Face/Bezel: Your model features a rotating diver-style bezel (often called a "Navi" look), which is less common than the standard smooth or fluted bezels found on most Eagle 7s.

• Case Material: Stainless Steel.

• Glass: Mineral Crystal.

Decoding Your Case Back

The numbers on the back of your watch tell its specific history:

• 4-815399 KT: This is the Case Number. The "4" indicates it was made after the late 1960s, and the "81" prefix confirms it uses the 81xx/82xx movement family.

• Serial Number (01105256): * The first digit (0) indicates the year of manufacture ended in 0.

  • The next two digits (11) indicate the month (November).

  • Given the model style and movement, this watch was likely manufactured in November 1990 (or possibly 1980, though the "Navi" style was very popular in the early 90s).

• GN-4-S: This is a Citizen internal code for the case type/water resistance style (usually indicating a water-resistant screw-down case back).

 for Collectors

• Reliability: The 8200 movement is legendary for lasting decades without a service.

• Rarity: The "Navi" (diver bezel) version of the Eagle 7 is rarer than the "Datejust" style models, making it a cool find for vintage enthusiasts.

• Day Language: Many of these were "bilingual." If you pull the crown to the first click and turn it, you might find the days listed in both English and another language (like Spanish, Arabic, or Kanji).

Pro Tip: Since this is a vintage mechanical watch, it is not recommended for swimming or showering. The seals (gaskets) inside have likely aged, so keep it away from water to preserve the movement!

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