I believe the code 866 printed on the rear cover dates it to August 1966 - I cannot prove this, though.
Since the booklet covers "all bases" by mentioning, manual watches, automatic watches, Watches with dates, waterproof watches, dive watches & chronographs, I assume would have been issued with most watches that Omega sold in 1966.
However, as stated above, the ONLY watch it explicitly mentions is the Seamaster 300.
If you have any older Omega Catalogues/brochures, you'd like to share, please feel free to E-mail me. I don't mind hosting this kind of information for others.
I don't think Omega will have a problem with me reproducing these pages on the internet. They are good enough quality that they can be used, but not so good that people can copy, print & sell them as originals.
I have written this page to share the limited knowledge & information I have. Please don't abuse me, my work or other peoples pictures. It's not a nice thing to do !
Finally, It pisses me off that I have to write a disclaimer like this !