The coating on the Citizen is kind of dark gren/brown and I am not sure how it is made.
Also the bezel ring is made of or have an different kind of coating, certainly not stainless steel.
Citizen was quite experimental in the 70`s when it came to materials and coatings compared
to Seiko.
No, you are not alone liking boxes.
It is really nice to have the original box to the watch.
But I find it even more difficult to find the boxes for the cheaper models, probably the buyer
did not think much of it and throw it in the garbage at once.
Like your 5Actus box, never seen one before even this is the most common 70's mechanical.
I also have a bunch of these Sportsmatic boxes but am not sure the watch inside is the original one.
I will try to post some more pics this weekend of other boxes.
/Bjorn