I've seen some head scratchers over the years but this one ranks right up there. Clearly marked "Tiffany & Co.", it looks at first blush to be more suited to carving poultry than to ventilating rogues and scoundrels. The trim appears to be sterling and the sheath is covered in velvet. A deep dive on the interweb turned up other known examples but it is not a common piece at all. 13" oa, 7.25" blade
I took the description off the auctioneer's web site along with the pics. If you have any questions or concerns, please call.