Production years are

A (1998) 1500 (495 produced pieces only), Tritium luminous material, Evolution: Gold calf strap, Bezel with 12 divisions, Case number:6506, ID starts with BB,

B 1500 (790 produced pieces only, Tritium luminous material, Evolution: Rubber strap, Case number:6528, ID starts with BB,

C 500, Tritium luminous material, Case number:6562, ID starts with BB,

D 2500 (1000 produced pieces only), Tritium luminous material, Evolution: New bezel divided into 60ths, Case number:6562, ID starts with BB,

E 2500 (1000 produced pieces only), Tritium luminous material, Case number:6562, ID starts with BB,

F 400 with Tritium luminous material, Evolution: New applied luminous dots, Case number:6562, ID starts with BB,

G 300 with Tritium luminous material, Evolution: BDR buckle, Case number:6562, ID starts with BB,

H 500, Luminova material, Evolution: New Slytech bridge, Case number:6639, ID starts with BB,

I 500, Luminova material, Case number:6639, ID starts with BB,

J 500, Luminova material, Evolution: Strap Interchangeabililty + Runner Lever + Null + New case back engraving with OP logo + Panerai logo on the buckle back, Case number:6689, ID starts with BB,

K 500, Luminova material, Evolution: New metalic clicks bezel + case disposed for new metal bracelet, Case number:6772, ID starts with BB,

L 500, Luminova material, Case number:6772, ID starts with BB,

M 600, Luminova material, Case number:6772, ID starts with BB,

N 600, Luminova material, Case number:6772, ID starts with BB,

O 500, Luminova material, Evolution: New backcase engraving “DIVERS PROFESSIONAL”, Case number:6772, ID starts with BB,

P (2013) 100 pieces, Luminova material, Case number:6772, ID starts with BB,

OOR* 20 pieces, Case number:6772?, ID starts with BB?, Luminova material,

*OOR means “Out of Range”