My first post. I came across a p.bockwoldt side by side 45 or 20 gauge muzzleloader. Its in good shape and has a couple of markings. P. Bockwoldt in Oldenburg on the top of the barrels. It has 2 fancy s,s on the bottom of the barrels and a 45. It has 2 triggers and a lot of engraving. Any idea on the age and value?