I recently showed Paul Basch a knife of mine, the maker instantly obvious from across a room. The maker uses a stylized version of his last initial for a mark, again, instantly recognizeable to any collector who would be buying such knives.
One of Paul's only criticisms was that the maker should spell out his name, as my children, or their children, may not have the benefit of knowing the style or the mark if they try selling the knife. His suggestion was that makers spell out their last names on all blades, in a way that keeps the mark from interfering with then knife's overall appearance.