Hello.
ZF or SF with P.3000 clone. Not the first version of SF, because the caseback is polished. For a more accurate identification, good photos are needed.
Look around the profile of the case, that it is the correct shape with a rib and thin lugs.
Make sure the crystal is round sapphire and not plexiglass.
Otherwise, he looks at the dial to understand if the latter is SF or ZF. It is difficult to catch the shade, but the transverse line of the letter A distinguishes them quite clearly (It's definitely higher on ZF)