The Universal Geneve Clapton used one set of main (hour and minute) hands and then multiple types of chronograph seconds hand, specific to certain Clapton serial numbers.
Unlike Universal Geneve Nina main hands, all Claptons have silver hour and minute hands, with luminous material (see bottom of this FAQ for comment on non-lume hands).
Both combinations of hands have the same length for each type of hand. The hour hand extends nearly to the inside end of the hour mark, with a slight gap. The minute hand will extend to between the end second/minute marks.
The chronograph second hand tip extends all the way to the 1/5 second marks (regardless of type). The tail should extend into the registers for the standard style tails (tail should end about midway down the 12 numeral on the hour register when chrono hand is at 0), and for the pointed tail should end at the bottom of the 12 numeral.
Early hands: seen up to 2.43 serials
This early set of main hands is silver, with lume, for both the hour and minute, and a blued chrono seconds hand, without lume.
Later hands: seen from 2.43 serials and later
Later hour and minute hands are silver with lume, but are paired with a red chrono seconds hand, without lume.
I have seen a few of pieces with a pointed end on the red chronograph hand, which leads me to believe these may be original to the watch. Unfortunately I have little information on some of the serials, but the ones in the database do not cluster around a particular period.
While we do see a few examples with hands that not have lume and a matching dial with no lume, these dials are still marked SWISS T, which should indicate that the dial contains tritium lume. It is not a piece I would personally collect, as my working assumption is that those watches have cleaned dials with incorrect hands. Perhaps more information will surface in the future and we can more definitively say one way or the other.
