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Anyone seen a Cal 12, marked '20' before?

Just spotted this on a Heuer C12.
Clearly marked '20' and seems to have 2 x scores on the edge.
I remember seeing somewher about the 2 scores on the edge but not the '20'.
Also marked 'SX'.

Anyone know the significance at all?
Apologies for the poor photo - my camera's being serviced and i used my phone attached to a loupe :-)
AndyO...

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