NOS-NIB Record, Dura Ace and 600-Ultegra headsets

I have a dura ace french threaded headset, the lockring is marked "M 25"... look at the washer, and measure it. If you have a known steerer tubes to try it on, that would help too
 
Many thanks all of you for the info.

I´ve just taken out the pieces from the box and here you have a pic of it. Looking at the black cup, I´d say this headset is also French...

What do you think?
 

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