SUBTLE DIAL DESIGN DIFFERENCES
A closer look will also reveal subtle differences in the dial design. The OP 36 and OP 41 are mirror versions of each other, while the 34, 31, and 28mm come with minute details unique to their size.
OP 41 / 36 – these come with double baton markers on the 3, 6 and 9 o’clock positions and painted squares beside every hour marker
OP 34 – these come with thicker baton markers on the 3, 6 and 9 o’clock positions and Roman numerals beside every hour marker
OP 31 – similar to the OP34, but with bold hashmarks at every hour marker instead of Roman numerals
OP 28 – with single baton hour markers and no hashmarks beside them. It also comes with two coronets flanking the words Swiss Made at 6 o’clock – a reference to vintage models where Tritium was indicated.
With this refresh, all Oyster Perpetual models regardless of size were also given the Chromalight lume, with longer-lasting blue glow.