I think the numerals etc. are on the fascia of that one. 🙁
The knobs are listed here and they only have the ridge to indicate the position, no stencilled numbers or symbols on them.
The fascia is available however although a bit more involved to change obviously. Part number is OFCSS434 and is about the £15 mark. If you email Dave on spares@ukwhitegoods.co.uk he should be able to get you a more exact price and availability.
Sorry for digging up an old thread but we’ve just moved into a new property and have discovered a Diplomat ADP3340 with no markings on the fascia. Looks like they have been cleaned off.
Have any of you guys an image or diagram of what the left hand knob markings should be? Just need a guide as can’t find any images online for this model.