Do you happen to know what caliber movement it is, if not is it manual or automatic?

Pateks are tricky to regulate, esp. if the movement has a Gyromax balance.

Is it solid gold?

It looks original from the photo.

For a Powermatic, I would expect the dial brand to match the movement brand, with "LeCoultre" on the insides of the case back in both cases.

I looked some more at the pictures and it is indeed a chronometer. Very nice example! I think a realistic price to an end user is under $5k but again, this is a gut feeling estimate, not one based in prior sales, etc. I have much more realistic consignment terms than C & C should you be based in the...

Looks like a lovely watch. My guess is going to be $4500, assuming it's checks out and has a chronometer grade movement. I don't have specific market info on the watch, so it's just a guess.

Try it now, I removed the limitation in theory.

Let me check on that.

You might want to post its photo. Thanks.

There are definitely alarms that came with unsigned crowns, typically the earlier ones, say before 1960 or so.