Production volumes are in year

PreA (1997) 240* pieces produced, Tritium luminous material, Case number:6500,

A 1500* (900 produced only), Tritium luminous material, Case number:6502, ID starts with BB,

B 3000* (1500 produced only), Tritium or Luminova luminous material***, Case number:6518, ID starts with BB,

C 4000** (2500), Case number:6518, ID starts with BB,

D (2001) 3500** (1500) pieces, Case number:6518, ID starts with BB.

*PAM00001, PAM00003 & PAM00004 gathered under the same millesimation,

**PAM00001, PAM00003 & PAM00061 gathered under the same millesimation

*** The move from Tritium to Luminova was during production of the B-Series. Until now no exact information by Panerai is known. The view of many Paneristi is:
PreA & A-Series with case number OP6500 & OP6502 had 100% Tritium dials (maybe changed during revision to Luminova)

B-Series with case number OP6518-OP6521 has less than 10% an original Tritium dial (some were flipped by owners from Luminova to Tritium to increase the value of the watch)

C-Series has 100% Luminova dials.

For more information review following website: https://perezcope.com/2017/01/19/panerai-b-series-sought-after-tritum-and-luminova-dials/

Known Serial Numbers for PreA with OP6500 case:
BB970004
BB970011
BB970019
BB970020
BB970345
BB970360
BB970361
BB970363
BB970364
BB970365
BB970366
BB970368
BB970369
BB970370
BB970371
BB970372
BB970373
BB970374
BB970376
BB970377
BB970379
BB970380
BB970381
BB970385
BB970389
BB970399
BB970400
BB970401
BB970410
BB970480
BB970494
BB970499