This knife began life as the CM-7, of which there were about 3,000 with rosewood handles, all serial numbered. Then we made 1,000 in India stag, African Blackwood, Coral Rucarta™, Black Rucarta™, Ivory Rucarta™ and only 2 knives in Mother-of-Pearl. The last time one of the two Mother-of-Pearl knives changed hands was about 15 years ago. It sold for almost $2,000.
We called this "The Vest Pocket Skinner" because it measures only 3-1/2" closed and the hollow ground blade is ground like a fine straight razor. This blade is not meant to cut cane or to whittle on oak. It is a precision instrument for slicing hide or flesh. The liners and bolsters are nickel silver. The steel is a proprietary high carbon stainless that takes a razor edge and holds it well. We only have about 3 dozen of the Coral Rucarta™ and less than 200 of the Black Rucarta. Made in Germany between 1975 and 1980 in the original Bertram factory. Blade is marked with the Hen & Rooster mark on the front side and Bertram, Germany on the reverse side.