A standard glass backpalte. I am still looking for a solid backplate to let it engrave. This is in a early beta-stage, like you would call it in software developement ;-)
A very bad idea. I rarely follow someone's projects, but I always follow this one.
Be mindful of which models the serial numbers were paired with to beat the ideal one, and don't go so far as to require a T dial.
And yes, I don’t want to be a provocateur, but what is this case?