You're in luck, since the originals were factory-made knives - and they were prolific in their manufacture and retailing efforts - there were hundreds of thousands of them, if not more.
Many were of European manufacture - many of the original styles still exist, today - with some made by the original makers.
So very few were handmade as to be of negligible interest to a serious Impression, and there were none of the modern varieties seen today.
In fact, there were 'very' few locking-bladed pocket knives - most showing up close to the century's end.
The difficulty arises in finding a 'nice' pocket knife that'd look as though it had no wear - as though it were a recent purchase.
Today, that's hard to do, since collecting pocket knives reached popularity about 30 years ago and has risen.
Still, they 'do' turn up at estate sales...
Get a copy of the reprint 1895 or 1900 'Sears, Roebuck' catalog that Barnes and Noble's sells - the big, phonebook-sized one - and you'll see all sorts of 'real' pocket knives and sheath knives available for sale during the era.
Back then - if you could read a catalog (or knew someone who could) - you could get any of the big suppliers to mail your purchases to the nearest town, if that town didn't already have a Hardware or Dry Goods store, and if it was later in the era - the mail might even bring 'em to the ranch.
As to my 'Notes' - I pulled them all quite some time ago - there are around 50 of them, and they go back a few years...
Vaya,
Scouts Out!