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Are you thinking of the Oyster Perpetual? The 36mm OP has a couple of dial colours with the 3/6/9 arabics, blue and silver. Same movement in them I think.
Edit: ah no, the OP uses the 3130, Explorer I uses the 3132, the latter has shock absorbers. Very similar watches though. Fully brushed case and oyster bracelet, polished bezel, no date.
The blue OP is very similar to the old blue Air-King, except the numerals are lumed now.
Friday new wristy and super chuffed 😊