Swiss sizing

Does anyone know how the sizing works on Swiss gear
I got this large pile of jackets today and not sure how it works
this is the only mark on them no other labels
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I've seen a great diversity of stamps. I'm not quite clear on what they were thinking at the time Some seem to have been remeasured later and not necessarily stamped the same. I have no idea why!

Generally speaking the top number is the standard metric size, which you'll see on most European surplus. So that's the easy one The lower one is, as far as I know, an indication of length. I think it's from nape of neck to waist, waist to cuff. But I could be wrong there.

The manufacturing year stamps sometimes look like sizes. From right to left, I see 1966?, 1963, and 1971.

I tried on two jackets yesterday Steve both were marked exactly the same
but one was small size the other was x-large