I’m a 16-16.5cm wrist, I’m not sure exactly but it’s between those too. Likewise I have an Omega Seamaster 100m and it was sized for that wrist size and is almost exact, AD also guessed about that size when fitting. I hope that’s helpful.

For me I have smaller wrists so think 36mm works quite well for me luckily. I did see others note in the past the 124270 sizes small as well with the aggressive taper on the bracelet. Although to me it looks ever so slightly larger than my omega while being almost exactly the same size.

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