All About Pocket Knives

I've recently purchased a large assortment of knives from a friend. Some I have been unable to obtain any real info on so hopefully my friends here can help.
First is a older finland knife. Next is a J. Jacobs marked marked custom knife with 440 steel. Finally is a totally unmarked knife. The sheath (Not sure if it's the original one) looks very similar to some Western, Boulder Co sheaths I have. Any help will be greatly appreciated.
Thanks.

I've partially identified the FInland knife. It is a Kauhavalainen Puuko knife, but still have no clue as to its age.

The other one looks Finnish as well.

The top one is a typical Finnish Puukko with stacked birch bark rings for the handle. Sheath looks like the pressed cardboard used during WW II when there was no available leather.
The bottom knife is a Finnish Boy Scout knife and the sheath is not original.
The middle knife looks like a Brusletto (Norway) blade that J.Jacobs marked and mounted the walrus tusk ? handle. Brusletto has sold finished blades for many years. Buyer mounts his own handle.
kj

Knew you guys would know what I had. Appreciate the help.