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Not Sure About the Timing of "MN"
In Response To: When did Heuer start marking Valjoux 72 calibers with "MN"? ()

Personally, I am not sure about the timing of the MN marking. I have a lot of photos of movements showing the "MN", but I have never attempted to figure out the date when the "MN" was used of the range of serial numbers that had the "MN".

If you have the serial number of a particular watch, that should be all you need to determine the approximate date of the watch.

Jeff

++++++++++++++++++++++++++++++++++++++

: 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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