Eterna Matic was released by the brand in 1948, using 5 ball bearings to revolutionize the movement and remove issues such as friction and resistance. This later became the brands corporate logo and still is to this day. This watch is working great, the stem and crown are operational, and it still winds and keeps time. There are some usual signs of wear along the bracelet and case. The crystal has some significant markings though the dial is still fully visible. The bracelet is 10k Rolled Gold Plated, and 177mm in length.