Anyone knows this vintage watch?

I want to know the history of watch and more information about the watch.
In addition, what is the meaning of back engraving?
Thank you very much.

[QUOTE="kazafks"]I want to know the history of watch and more information about the watch.
In addition, what is the meaning of back engraving?
Thank you very much.

The engraving is:

Rene Merz
In recognition of
25 years
faithful service
Sulzer Brothers PLC
1978

What a lovely reward for 25 years of loyal service!!!

I do hope that Mr Merz was not disappointed that it was not a gold watch.
Beautiful IWC Automatic with probably 8541 movement.