Greetings to all Id like to share what Ive found about the watch bellow and see the good thoughts that usually come up. Does anyone knows anything about this speciemen here? According to history, many cases were developed to a top notch watch launch, an automatic chronometer, that later would be named Constellation that only took place in 1952. This case was one of these "test"; lugs not seen before. Caliber in-house 330 (30.10 RA PC AM 17 P). So we may have here a 30mm automatic, first one designed by Charles Perregaux by direction of Henri Gerber.