A brass plate, similar in size and shape to the above illustration, is lastened each Singer Sewing Machine made for manufacturing purposes. This plate is usually at the right hand upon the arm, and hears the two numbers that designate the machine. As Class 29K Machines are furnished in a number of varieties, each of which differs in detail from the others, it is necessary when ordering parts * or supplies (unless the correct number of each part is known) to slate the (lass and variety of the machine, as shown on the brass plate, and so prevent misunderstanding and delay in filling orders.