I am starting this thread to collect examples beyond my collection of Swiss "Half" Chronometers. I theorize that these came from two processes: 1) The maker either rated the timepiece themselves or had an unofficial service measure the rates 2) They went to the Chronometer service and failed. As per the thread on lovely ladies on the European watch area, Henry Capt sold both types. Of the one I have seen the half versions do not have numbers engraved on their movements. Until I looked up the rules as published in journals at the time, I believed the serial number had to be engraved on the dial plate. I found that this is NOT a requirement at Geneva from 1872 through 1885 and probably not until the 1890's. Instead, the watch had to be submitted with a letter essentially identifying its features, a serial number, the maker and adjuster as well as attesting to where it was finished and adjusted and who adjusted it. Henry Capt was an active participant and won several prizes. The firm submitted a lot of timepieces for testing and now I believe they put the serial numbers on these to identify which was which. I have a few of these but not enough for much certainty in this. I have seen some example at on-line auctions sold with original seller rating papers and called half chronometers and I suspect Henry Capt half chronometers were sold this way. Other makers sold this way because they wre not close enough to Geneva or Neichatel to be eligible to participate in official testing. Some, I believe, were labeled half chronometers because that failed to meet the requirements. Records show that they had about he same proportion of failures in all three classes of trial. My guess is that if the timepiece did not fail by much was marked as a half chronometer and sold without being re adjusted and tried again. One reason I suspect this is that I have seen several with the words "Chronometre" and "Demi" in differing styles suggesting the watch was cased and marked "Chronometre" but failed and need a change ib marking. I invite discussion, argument ,and submission of examples. I will put up some of mine in the coming days. I am especially interested in examples with differing scripts for "Demi" and "Chronometre" and rating cards for half chronometers.