Its a complex subject.
There are lots of fixed shank other ranks buttons, but I don't recall seeing a drop shank button in Officers quality?
Officers often had to purchase their own insignia and it was up to them how much they paid and therefore the quality they received, also in some far corners of the world options were more limited. Also senior Warrant Officers were often allowed to upgrade to better quality.
This I would class as Officers quality, the rear construction is seamless.
These I consider to be other ranks quality but they may at times have been worn by Officers?
This one I can't decide?
