Thanks Barry,
There's more than one way to skin a cat, as my grandmother used to say ...
Probably I'm overthinking it and it just doesn't matter that much, but my question is about what's the
best
way to achieve the outcome. I'm new to setting up my own projects - I've always relied on my employer's templates and masters - even though I have several years of working with Archicad, I don't have much experience in some of these basic principles.
Following (I think) Eric's advice, I now have a layer combination called "NFC stamp off" which I can apply to the masters relevant to the layout book. That seems quick and simple and reasonably foolproof - but I'm still concerned there may be pitfalls I haven't anticipated. Still, I think it may be better than than using a second master? Deleting the stamp between issues makes sense, but I'm setting up a template here, and I will need to go though this process with each new job - sooner or later I will delete the stamp before I should have.
Anyway, thanks again again for your answer!
AC26 Australia, Windows 10