kaywoodie;
Top of the morning to you sir, I hope the week behaved and you're all well down in your section of Texas.
If I was going to guess on the age of that and let's be clear here I'm only a bit of a serious student on older blades, I'd guess it to be post Civil War era but maybe not by much.
As you know the British cutlery industry was huge at that point, as was British influence everywhere in the world, so any young adventurer from Continental Europe, Britain or anywhere in North America would be the target buyer for that knife.
Enough of them were military or military contractors of sorts that the frog stud on the sheath makes sense. Anyone on the frontier from Afghanistan to Edmonton down south to San Antonio would be used to seeing that during that time frame I'd think?
While I have personally developed no ways and means of making this happen, perhaps if I ever land anything that cool in my collection, I'd try taking it out on a still, full moon night and with said full moon over my left shoulder, see if I can hear it whisper to me....
My goodness sir, the stories it could likely tell.
All the best and good hunting.
Dwayne