Vintage SEIKO Challenge Timer Chronograph Wristwatch. Reference 67-9577. Serial Number: 31101663. Black / Stainless Steel. Automatic Movement Caliber 8100A, with Quick Set Day (two languages – English/Spanish), Quick Set Date, and Flyback Features. Leather Cuff Bracelet. . Made in Japan. Circa 1973

Movement: Automatic (self-winding) chronograph. Certified chronometer. Caliber 8100A. 23 jewels. Bidirectional rotor. Index regulator. Signed “Citizen, Japan”.

Dial: Matte black (original factory). Applied “Citizen” at 12 o’clock. Applied silver faceted hour indexes. Minutes/seconds divisions. Outermost white Tachymeter scale. White and black hands. Orange sweep center seconds for chronograph. Silver subsidiary dial (30-Minute register) at 6 o’clock. Apertures for Day (English/Spanish) and Date at 3 o'clock. Signed “Chronograph, Automatic 23 Jewels, Japan 8100 900054-Y”.

Case: Black body. Steel plane bezel. Mineral crystal. Solid hooded lugs. Steel crown at 3 (signed), and round buttons at 2 and 4 for chronograph functions. Stainless steel screw-down back, signed and showing reference and serial numerals, and case features.

Dimension: 38 millimeters diameter (40mm including the crown). 45mm lug to lug. Distance between lugs (to fit another bracelet): 18 millimeters.

Bracelet: High quality genuine leather Cuff strap / band. Brown color. Steel buckle.

This watch fits in wrists up to 7.36” inches circumference (187 millimeters), and can be adjusted for smaller wrists using the leather holes.

Condition: This timepiece is in very good overall condition and working in all its functions. Some signs of use on case: slight scratches and some small dings. Dial is complete, readable, and most important, factory original, showing minor aged patina on Tachymeter scale edges. Movement is clean and running well. Bracelet is brand new (please check the larger photographs and video for details).

Images and description from the original piece. Sold as described and shown

Since this timepiece is pre-owned and vintage, should not be considered as Waterproof. We can’t guarantee the watch to be 100% waterproof because it has not been pressure-tested

Attention US Customers:

Due to new US government customs regulations, as of August 29th, 2025, recipients will be required to pay customs duties, currently estimated at approximately 10% of the item's value, and possibly courier expenses in approximately 2%, to ensure the package continues on its way to destination.

Please consider this announcement when purchasing or bidding, as once the item begins its journey, it will not be possible to stop it, and the return process for rejection is lengthy and even more expensive.

Thank you very much for your attention.

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Please read this next important information before buying or bidding:

All our items are photographed and described from the actual pieces, so please check carefully photos and description to avoid any future inconvenients.

Shipping: The item will be shipped the next working day after the payment is received, so if you pay by Friday afternoon or during the weekend, have in mind that your item will be shipped by next Monday, or the first working day in case of a Holiday or National day.

Combined Shipping Option Available! Buy more than 1 item, and paid the same shipping cost, till 1,5 kilo (50 oz) weight.

As an International Shipment, Customs Duty Fees or similar Taxes may be Applied depending on the Country of Destination Laws. Those Expenses are in Charge of the Buyer. Thank you

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Thank you!

rilwatches team