Just curious about this, I've got two watches now that have clover shape crowns with the Omega symbol on them, and a three pointed start shape symbol inside the Omega symbol, which Dennis mentioned meant it was a Naiad crown. Now I remember hearing about the Naiad crown system in the past in relation to Seamaster 300s, where it was described as a flawed design whereby rather than having a screwdown mechanism, the pressure of the water increased the pressure of the crown seal such that the deeper you went, the greater the seal, however that in shallow water the pressure was insufficient to make a good seal at times and resulted in leaking. Now that makes a bit of sense in a dive watch but give these are snapback solid gold dress watches, their water resistance at depths which would be useful to the Naiad system would be impossible due to the crystal and caseback seal. So I guess I'm just curious as to why something like that would be used on these dress watches? Also I'm wondering, are these crowns in fact original to both watches, and what years were they used? Also are these crowns worth keeping, or would the 10 sided Constellation crown be the better and more correct choice for the Constellation?