I've got this one on mine:
Only major glaring flaw with it (aside from the font type) is that the depth rating should be 30ATM, not 300M.
From a well known P-site's archives:
All in all, there are two ways of checking whether a watch is genuine pre-A.
1) The relationship between serial number (BB) and millesimation number (/1000) should be consistent and logical.
For OP 6500 watches, the last 4 digits of the BB-number or serial number should equal the 4 digits of the millesimation number.
OP 6501 watches are always considered pre-A.
For OP 6502 pre-A watches of the second batch of the first series, the last 4 digits of the BB-number or serial number minus 400, should equal the 4 digits of the millesimation number.
For OP 6502 pre-A watches with prefix "A", the last 4 digits of the BB-number or serial number minus 1400, should equal the 4 digits of the millesimation number.
2) Assuming that no more than 1300 pre-A Luminor and Luminor Marinas were made, ANY Officine Panerai watch with a serial number lower than BB 971700 is a pre-A watch.
1000 total OP 6500 Luminor and Luminor Marina (PAM 001, 002, 003, 004, 009 and 010) 0XXX/1000 and OP 6502 (PAM 001, 002, 003, 004, 009 and 010) AXXXX/1000, and
400 total OP 6501 Mare Nostrum (PAM 006, 007 and 008), and less than 300 total OP 6502 Luminor and Luminor Marina (PAM 001, 002, 003, 004, 009 and 010) A0XXX/1000
Total: 1000 + 400 + max. 300 = max. 1700 pre-A watches including the Mare Nostrum.
How many of each? Luminor, Luminor Marina, PVD, white dial? No one really knows...