This is a rare non-Oyster Rolex Ref. 2831 from the 1930s, featuring a matte white applied Arabic numeral dial.
At first glance, the matte white dial appears simple, but it is elegantly designed with gold-colored applied Arabic numeral indices paired with blue steel leaf hands—a classic dial design reminiscent of Bubble Backs from the same era.
While the case size is nearly the same as that of a Bubble Back, its distinctive case shape and the large dial unique to non-Oyster models give it a presence that exceeds its actual dimensions, making it a truly remarkable timepiece.