...it does rather look like at least the base movement. Not only the shape of the balance cock fits but also:
- the shape of the lever cock
- the exact positioning of the gears in the geartrain in relation to each other (angle between 2nd, 3rd and 4th gears >135°)
- positioning of the stem release screw
Did Orator make this movement as a chronograph? Not necessarily. Sometimes, makers bought base movements and added their own chronograph mechanism (a modern example would be Habring, using the Unitas 6497). Also, I have no record of Orator making chronograph movements. However, that doesn't rule it out.
And in the end, it might even not be an Orator movement at all.....
Hartmut, there is a little note from Dr Ranfft at your link that I guess you read:
"The calibre was assigned to Orator due to the unique shapes of balance cock, regulator. Moreover a Chronograph Orator 497 with nearly the same base plate is known. But in other movement catalogues this calibre wasn't yet noticed."
Sorry, a definite fail. Look at where the third gear is on both movements: in yours, it's covered by the main part of the chronograph clutch gear whereas in the LIP, it's inside that gear. Other differences:
- the balance cock is completely different
- the shape of the lever cock is completely different
- the stem release screw is closer to the stem
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