It's got quite some rust. Possibly an early Leatherman?
And here's a link to a gallery of pictures for a knife made in 1869 with a similar cork screw.http://www.hallowellco.com/ott___ivory_handled_combination_.htmI am also rather tempted to say, since your knife has fork and spoon, that it's possible that it doesn't also have a can opener because it hadn't yet been invented, which would only push its age back to pre-1855 or thereabouts. That's a complete guess on my part.
Great banter! And great ideas! Thanks! You know, that coca-cola bath was the first thing to cross my mind as well. Ha! What an oddly fascinating thread that was. Anyway, this tool is currently running for ten bucks. I would personally feel some victory in having found and acquired such a relic at such a price, but beyond that I'm not really into holding on to useless antiques. Any advice?Sent from my iPad using Tapatalk