I have a Smithsonian bowie with the brass lugged hilt, concave shaped grip and the scalloped brass coolie cap. The handle material is what I believe is an ivory colored micarta. It is yellowish in color. I bought this knife about 20 years ago from an older gentleman that had it in his collection. I recently bought a Raymond Thorpe and a Confederate bowie with white handles. A catalog I have from 2013 lists a new ivorite handle material, but says it is only available on knifes with up to 9" blades. I am curious about what handle material might be on the two newer bowies and if it will age to a yellowish tint like the Smithsonian handle or could be aged to look like the Smithsonian handle.