40 jewels42h power reserve28,800 vph (4 Hz)
The OP XXI is an automatic mechanical movement used by Panerai. It runs in 40 jewels. The balance beats at 28,800 vibrations per hour, and the power reserve is 42 hours. Panerai fits it to the Radiomir One/Eight second and Radiomir Regatta 1/8th Second Titanio.
Last updated 11 Oct 2026Suggest a correction
TECHNICAL SPECIFICATIONS
Movement Type
Automatic
Jewel Count
40 jewels
Power Reserve
42h
Frequency
28,800 vph (4 Hz)
Display Type
Analog
COMPLICATIONS
ChronographSplit-Seconds
QUICK FACTS
FOR WATCH DEALERS
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