1969 Omega Speedmaster stopping

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There is a lever that should block the reset when the chonograph is running.
Think of it as you are timing something & your intention is to stop to read the elapsed time.
By mistake you push the rest instead, everthing will rest or fly-back to zero.
Should not be able to reset while chronograph is engauged.
Hope this is clear!
Mike

Hi Mike,

Yes I’m pretty familiar with how they work. I was curious what is adjustable that requires this test. Of course it shouldn’t reset when it’s running.

Cheers, Al