Is that hole in the top lever original?
With the proviso that it is hard to make a good assessment of condition from photos and with no first hand knowledge of the condition of the barrels, I would hazard a guess in the $1200 to $1500 range, subject to actual knowledge of condition.
But mine's just one opinion. I'm basing mine on my own limited experience with Piepers and what I've paid for them over the last five years (4 boxlocks and a sidelock) as well as what I have actually paid for a couple of sidelocks from other not well known continental makers in the last year.
I saw a VERY similar Pieper move a little more than a year ago for I think just under $2000. It seemed to be in substantially better condition than this one. Wood finish much better (according to photos) and again, while hard to tell from photos, the engraving seemed crisper (I suppose it could be the lighting in the photo). Checked the serial numbers...close but different.
Can anyone date this gun. I'm terrible at it, even when I'm holding the gun, looking at the flats and referencing proofs from my books.
Regards,
James