There has been some confusion as to when the square end chrono, replaces the drop end. Many say it came in on the 145.022 but there are so many 145.012’s with it I believe it is a correct fitment. We also see calibre 861 Transitionals carry both types.
Here is the square end, that was first seen on 145.012’s:
|Square end Chrono||Drop End Chrono|
Recently I was contacted by an owner who showed me his two near NOS 145.012’s watches, and who’s history he knows. Looking at them they are in exceptional condition. The serials are very close, but the later number carries the square end. He tells me both are unserviced, and unaltered.All further photos in this post are his.
Note the chrono hands. Here is the earlier watch:
And here is the slightly later one showing the square end:
Many thanks to Ralph Cal_11 for some of these pictures and information.
In conclusion I accept square end chronos on later 145.012’s.
I also accept as original drop end chronos on early 145.022’s.