Schmachtenberg bros. Knife?????????

[M.FREEZE]

I found an old Schmachtenberg Bros. knife that is made in Germany. I do not have any idea about what it is or when it was made. It is a double blade slipjoint. It has a main blade that looks to be a pen blade, and a secondary blade that also looks like a pen blade. It appears that the handles are real mother of pearl. It has brass pins and liners. It is bolsterless and 2.5'' closed and 5'' when both blades are open. Is this knife rare or common? Is it worth anything or is it a cheapie?

Any info will help. Thanks.