I know this is a Heuer forum but....
...Here is a very interesting non-Heuer. This Zenith El Primero Luna Lux is different from any that I have seen. It is all 18k with an integrated/permanently attached 18k mesh bracelet which appears to be factory done. It is accompanied with a letter from the Zenith factory dated September 1970 which confirms the sale of the watch to the original customer along with setting instructions. Have any of the Zenith fans here seen one like this? BTW, this is not mine...at the moment. I am sorry about the copyright info and for the iPhone photo but the owner is particular and the iPhone was all I had at the time.
JohnCote