Unusual "Barrel" Knife

[Rich]

ANY information about this knife would be much appreciated. Who made it, where(country of origin), when, what do the initial mean? I know nothing about this knife other than it looks somewhat Nordic. It is about 3 1/2 inches (9 cm) long closed. By lifting and sliding the lever, one slides the blade in and out.

http://home.earthlink.net/~rsblade/barrel.htm

Thanks.
Rich