Yeah, a shot in the dark for sure but it is #5 by some maker that used the Rampant Lion in a shield as a trademark & I for one would guess the other marks are not actual proofhouse marks but internal process / proofmarks by the maker, although the possibility exits that it passed thru some odd proofhouse under our radar. I also agree w/ Mr. Brown that the PF surmounted by a crown is for Polvere / Poudre / Powder / Pulver, etc. paired w/ the F. Remote possibility that there are marks on the back sides of the locks or on the hidden portion the frame. But again, the tubeset was sourced directly from Sauer. I do fancy how the tubes were struck to leave a little extra metal for reinforcement, which is hidden by the adornment.
Cheers,
Raimey
rse
