It appears to be part of a custom set where the center box would hold the initials of the owner. Since there are not initials you would be led to believe that the razor was made before an order was placed so more then one exists, like the fancy pocket officer sets you see with or without initials. But this one must be extremely rare. However an engraved head on an Old Type is not unheard of. An ABC pocket was made with the Gillette trademark on the cap.