Introducing a Swiss Modernista pocket watch from the early 20th century

This is a rare type of pocket watch with jumping hours and retrograde movement.
When the time changes with Jumping Hour, the numbers in the small window at the top click and change.
A retrograde minute hand moves half a revolution from 0 to 60 and then suddenly returns to 0 again.
Although it is occasionally seen in quartz wristwatches, it is a rare type in mechanical pocket watches.

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

(Explanatory video)
https://youtu.be/q_nj37WcIAk?si=e049bBrVysnUpMgY

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

Function: ★★★★☆ Maintenance history unknown but in good working condition (daily accuracy within 5 minutes)

- Case: There is some wear due to age, but no noticeable scratches or dents.
- Case engraving: The back cover and inner cover are also engraved with the manufacturer's mark.
・Dial: In very good condition with no stains or missing letters.
Other: The crown is a little stiff to turn when adjusting the time.
Accuracy: within 3 minutes per day when measured with a flat timegrapher
Power reserve: from full spring to 32 hours

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

【detail】
・Brand: Modernista
- Year of manufacture: 1920
Movement: Mechanical
・Mainspring: Manual winding
・Time adjustment: Pull the crown (pendant set)
・Serial No. 19507 (case)
・Case material: Gold plate
・Case diameter 50mm (excluding crown)
・Case thickness 15mm (including windshield)
Weight: 89g

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