Hi there, hope everyone is having a great holiday season! I'm still in the process of learning all I can about the Carrera before purchasing one, and came across this one today with MN and SOX on the movement. The seller says its possible the bridge could be a replacement. In this case, what is the significance of the MN? Does this mean it is a 92 movement not made by Heuer? Would this affect the value of the watch? Does anything in this movement strike anyone as off?

Also the crown is unsigned. Should Carrera crowns be signed to be original? Or was there a phase in production where they were unsigned?

The Crystal and tension ring are apparently NOS replacements. I don't mind this as long as it is authentic to the period.

Would love to get your collective wisdom on this and always looking to learn more about these beautiful watches. Wishing everyone an excellent New Year!