Thank you for watching.
This is the "Challenge Timer," a masterpiece automatic chronograph from Citizen in the 1970s, also known as the "Horn Chrono," which was carefully preserved by my father, who was a watch collector.
Based on the engraving on the case back (4-901037 TA / 67-9038), this is an original vintage model from that era.

[Functionality and operation confirmed]
● Movement: The automatic winding starts smoothly with a slight shake and is functioning properly.
● Stopwatch function: We have confirmed that the start/stop and reset functions (returning the hands to the 12 o'clock position) operated by the push button at the 12 o'clock position all work smoothly and without any sticking.
The flyback function also works without any problems.
● Calendar function: The date and day of the week can be quickly advanced (quick change) by pulling the crown out one click, and all functions switch smoothly.
*To change the day of the week, pull the crown out one click and then press the chronograph button on the lower right until it clicks.

[Product Condition]
● Accessories: None (watch body only)
● Maintenance history: Overhaul history is unknown. Long-term accuracy (daily deviation) measurements have not been performed.
● Exterior: There are some minor scratches due to age, but it remains in good condition for a 50-year-old vintage watch. There is a small scratch on the upper left of the case (circled in red in the photo), but there are no other noticeable large scratches on the case, crystal, or dial, and the edges are sharp.
The dial and hands show minimal fading, making it in excellent condition.

[Size (approx.)]
● Case size: Approximately 3.8 cm wide (excluding crown)
● Case height: Approximately 4.5 cm
● Wrist circumference: Approximately 17.0 cm

Original examples with all functions working perfectly and the original bracelet still intact are becoming increasingly rare each year.
I would be happy to pass this on to a collector who will cherish it or someone who understands vintage watches.

Payment must be made immediately after the item sold.
We will ship the item asap after your payment clears.

We will ship to worldwide by EMS (Insured, Trackable, Including handling cost.)
EMS (takes 4~7 days, includes with insurance & a tracking number).
EMS (Express Mail Service) is international mailing service by Japan Post Office.
We will ship your item within 3-5 business days, after your payment.
We can ship ONLY to your Paypal address.

Money back guarantee within 30 days if returned by customer.
We offer 30 days money back guarantee for defective products.
However the buyer must pay money for returning it back to us.

A specialty shop offering a wide variety of carefully selected Japanese brand items.
Unless marked "used" all of our inventory is brand new, so you can feel confident about your purchase.
Even if you think to yourself, "But the item I want is only available in Japan.", make sure to consult with us before giving up hope.
We will look for and suggest the best products on your behalf.

Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer's responsibility.
Please check with your country's customs office to determine what these additional costs will be prior to bidding/buying.
These charges are normally collected by the delivering freight (shipping) company or when you pick the item up - do not confuse them for additional shipping charges.