In the case of a 3646 California, many refer to it as a PANERAI piece, but nothing shows anything else than it being a pure and simply Rolex watch.
Regarding the hands, they aren't many hands configurations for any of the Rolex/Panerai
models: 2533, 3646, 6152s 6154, (most
supplied to PANERAI, some very few were issued by Rolex (well that what till know
is being known, seen and observed).
Hands configurations: 1 set for the
3646 Radiomir, 2 sets for the 3646 California, 2 sets for the 6152, 2 sets for
the 6152-1, (I think) only 1 set for the 6154
Some of the Panerai Vintage pieces are showing us other configurations.
This is because and foremost due to the shortage of spare parts, as for those pieces
used during and post WWII, repairers, watchmakers etc. fixed these watches with
what would work thus explaining why some strange configurations.
With Panerai always remember that till very recently it was only a military
secret.