On an incautious whim, I recently bought a somewhat mysterious KW detent chronometer at a German auction for a relatively modest, if large, amount (detent chronometers prices generally are quite high). The watch may not have been a bargain except in its high mystery-to-dollar ratio. I would appreciate your views on the many questions I have about it. The watch is in open-face swing-out case that appears to be made of silver. The case isn't hallmarked. Rather, it is stamped CFK, Dresden. It is 56mm in diameter and weighs 135 grams. The dial says Frodsham, Gracechurch Street, Chronometer. This is not a Charles Frodsham dial. It is either a John or George Edward (G.E.) Frodsham dial. They were well-respected watchmaker-relatives of Charles Frodsham. According to the auction house, the watch was made around 1820, but I have no confidence that this date is accurate. The watch might be 30-40 years newer. The movement is freesprung. It appears to have an Earnshaw spring detent escapement and a Pennington balance wheel. It has either a helical or tria-in-uno hairspring. The movement is completely unsigned. My very knowledgeable New Hampshire watchmaker said the movement was "beautiful" and in good shape though needing servicing. The auction house touted the watch as having an especially interesting set of original "moon" hands, unusual in that the "moon" on the hour hand is quite a bit larger than than the "moon" on the minute hand. I am skeptical that the hands are an original matching set. I do not have a good photo of both hands, just the hour hand. It broke at one time and has been soldered back together. The minute hand is in much better shape and appears to have been made out of gold. I had the auction house ship the watch to my watchmaker. He sent me many pictures. I have attached the best of them plus the movement photo on the auction house's site. For all of my watchmakers photos, including films of the movement in action, see Dropbox - 6848 Lipsig Ethan - Frosham Gracechurch St chronometer silver pw - Simplify your life Here are my questions: Do you agree that the movement is English? Was John or G.E. Frodsham really the source of this chronometer and, if so, which one? Is it an original combination of case, dial, and movement, a recased original movement/dial, or a completed mishmash of case, movement, and dial? Did English chronometer makers export uncased movements? Why would John or G.E. Frodsham (or whoever made the movement) have sold it completely unsigned? How common was it for the maker, finisher, or retailer of a fine chronometer movement to have sold it completely unsigned? Have you seen English watches with original sets of moon hands with moons of very different sizes? Is this watch's hairspring a tria-in-uno or just a helical hairspring? Do you agree that it has a Pennington balance wheel and an Earnshaw detent escapement? When do you think it was made? Do you have any other comments?