I I purchased this with a another running watch. This one had a stuck back and I did not know what it was. I have it running now it was just gummed up. After a good bit of research I cam to the conclusion it is a Longines 18s or 21 liegns 21 jewel Certified Chronometer caliber 21.59. I would very much like for someone who knows about these European watches to verify my research.

Thanks,
Harry

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Longines it is. It's like my 21.29 in my Swiss pocket mov't parts drawer.

Thank you William. I was pretty sure it was as I found a Chronometer mounted in a ships wooden box suspended bu for arms. It was a ships clock and looked just like mine except I believe it was 17j and mine is 21j. It said it was a caliber 21.59 so I don't know if the 21j is a different number but I assume the caliber 21.59 would be very close.

Thanks again William,
Harry