This is a very interesting American made Philadelphia Pistol.  It bears no European proofs and has strong markings.  The barrel and breech are solid German silver (white brass).  The stock, which is finely checkered,  is walnut with a German silver trigger guard and cap box.  The inlays appear to be either German silver or Sterling.  The barrel is 6 1/4 inches in length in about .40 caliber, smooth bore.  The breech, trigger guard, hammer and lock are finely engraved.  The lock is engraved Evans & Hassall and the barrel is engraved Evans & Hassall 418 Arch Street Philadelphia.  I see no repairs or replacement  parts.  I have never seen this particular marking and I assume this is a very rare Philadelphia maker.  A nice, striking little Philadelphia pistol.  SOLD!