Antique Rosskopf pocket watch from around 1900, silver side, diameter 55mm, railroad watch, in good working order

We would like to introduce you to pocket watches from the Swiss watch manufacturer ROSSKOPF.

This is a large pocket watch that is believed to be from around 1900.
There is an engraving of a locomotive on the back, making it appear to be a watch used in railway construction.
The crown is stiff and the power reserve is short.
It is unknown whether it has had an overhaul, but the balance wheel is in good condition and ticks along smoothly.

We hope this once-in-a-lifetime encounter will be a special one for you!

(Explanatory video)
https://youtu.be/TrttUtlfFJQ?si=kdO9ay6enu4kaCST

【condition】
Appearance: ★★★★☆ Excellent condition with no noticeable scratches or stains

Function: ★★★☆☆ Minor defects but still in usable condition

・Case: There is some wear due to age, but there are no noticeable scratches and it has been well maintained.
・Case engraving: The manufacturer's mark is on the inner lid
・Dial: There is a chip on the outer part between 6 and 7 o'clock
Other: The crown is quite stiff when winding the mainspring.
Accuracy: Approx. 3 minutes per day when measured with a flat timegrapher
Power reserve: 25 hours from full spring

*The daily difference may vary depending on posture, so please use this as a reference only.
*Because it is very old, I do not know the history of parts replacement or repairs.

【detail】
・Brand: W.ROSSKOPF Co.
- Year of manufacture: Around 1900
Movement: Mechanical
・Mainspring: Manual winding
・Time setting, dowel pressing (nail set)
・Serial No. 22061
・Case material: Gold plate
・Case diameter 55mm (excluding crown)
・Case thickness 18mm (including windshield)
Weight: 120g

*This is an antique item and there are no other items exactly like it.
If you have any questions, please feel free to ask.