I've never seen a signed Crown Grade (am assuming you mean Kraus signed?), and for years believed Kraus never signed any of his work based on the comments received from one of his personal friends; but having recently seen two signed higher-grade examples that I believe are authentic, I've changed my mind and there may be a signed Crown Grade somewhere? Based on what I've seen, he signed Smith guns "A.E. Kraus". The signature is very light, almost concealed; and the examples I've seen were signed beneath the opening lever or near the top tang screw. If signed under the opening lever, only the "A.E. K" is visible; and only with the opening lever pushed to the right side.