Hand cut scored and dyed bone was standard on lower priced table cutlery and pocket cutlery made in Sheffield from around 1820, especially for export to the USA. It was done with a knife edge file and some potassium permanganate for the color. This type of scale is never flat -- it is either rounded, using the natural outer surface of the bone, or it is faceted. There are MANY different filing patterns.The name that the Sheffield cutlers gave to such handles as these was "scratted bone." A Jos. Rodgers catalog reprint "dated" 1894, but in fact from between c.1901 and 1912, includes one large pruner with the old style scored bone handles. Some Sheffield firms continued to offer "obsolete" patterns and construction as long as there was enough demand to sell them profitably.