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When did Heuer start marking Valjoux 72 calibers with "MN"?

I understand that some early 2446s and 2447s have Valjoux 72 calibers without "MN" inscribed on the baseplate left to the "72". Can anyone please guide me to the approximate year of serial numbers when the switch to the "MN" marked calibers began?
Your help is much appreciated.

Cheers from Switzerland
Richard

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