I have four P2s. Details below:
Solid 14k, GF Band-
“* Stainless Steel
14828
MIN. HR.”
Clasp dated 11-73. Old module type.
Works perfectly
SS Astronaut-
“* Stainless Steel
35865
MIN. HR.”
Clasp dated 6-73. Newer module type.
Works perfectly
SS Astronaut-
“* Stainless Steel
69418A
MIN. HR.”
Clasp dated 11-73. Newer module type.
Doesn’t work
Gold-filled-
“* 10K Goldfilled
17301
MIN. HR.”
Clasp dated 12-73. Newer module type.
Doesn’t work
The fact that my "solid" has an early module, and an early serial number on the caseback could suggest the caseback is original. Coupled with the many variations of casebacks highlighted in this thread and the others Bruce reference, make it even more possible........it's a shame there's no way to prove it !
Rgds,
Andrew.