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2. Panerai
3. Calibers
4. OP XXI

Panerai caliber OP XXI

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Brand:	Panerai
Reference:	OP XXI
Base:	ETA 7750
Movement:	Automatic
Display:	Analog
Diameter:	36.60
Jewels:	40
Reserve:	42
Frequency:	28800
Chronograph:	Chronograph, Column wheel, Foudroyante, Rattrapante
Hands:	Hours, Minutes, Small Seconds

OP XXI description

Foudroyante split-seconds movement based on a a LaJoux-Perret modification of the 7750.

All watches using the Panerai OP XXI movement:

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PAM00246 Panerai Radiomir 1/8 Second

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PAM00343 Panerai Radiomir Regatta 1/8th Second Titanium

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FER00025 Panerai Ferrari Scuderia 1/8 Second